I remember when people started swarming a Rome II mod for the Socii having green swastikas on their shields.
I think there was US Army force from the Southwest that used swastikas as a symbol thanks to its meaning to the First Nations people. They, um, ripped them off on the ride over to Britain for the Normandy Invasion.
It's been around since Neolithic times.
Coincidentally, Arlathan and its use as a slave symbol is about as far back to the modern Dalish as the actual Neolithic times are to us. And I'm willing to bet that the symbols were all over the place, in temples and tapestries and mosaics, not just slave brands. They were the symbols of the gods, after all. The Dalish, lacking temples, just put it on their face. Very practical.
That, and the lovely shade of purple, is why my Lavellan kept her vallaslin. 
Oooh, welcome back!
I predicted this. 
We've lost some people and the theory crafting has died down a little, but it's only to expected after the game has been out for half a year.
The initial digestion phase is just ending but with each passing month there are so many new replays that theory crafting will sooooooar now!
So, my catch-up thoughts:
Solas and Cole. I thought it was pretty suspicious that Solas could do that blocking Cole out trick in the first place and I wondered why we weren't given a conversation interrupt to ask Solas how he did that. There is a lot that we are asked to take for granted regarding his knowledge and unknown skills. In hindsight, it makes sense, but the fact that we couldn't ask about his "spirit magic" (I'm assuming it was spirit magic related at the very least) drew attention to it. After he leaves makes it even more suspicious, but at least there we're already aware of the situation, so it ruins nothing plot-wise.
Putting that aside, there's the question of how this is in keeping with his character: I think it can still fit despite his disposition. His affection for spirits and his obvious attachment to freedom of will and all of that do not necessarily come into conflict with his act with Cole. I agree with the sentiment that in this particular case blanking Cole's memory can be viewed as an act of compassion, partly because it is so important in terms of keeping his secret from the Inquisition. Thinking about the guaranteed backlash that a revelation of his identity would cause, I think in Solas' mind it would have caused everyone much, much more harm for him to be exposed than if he keeps everyone in the dark, thus he has to cover his bases and his action is justified. As it's been pointed out, wiping memory sometimes helps, just as one might get rid of negative thought patterns to alter the course of their life - it is not a subjugation of free will, rather a therapeutic act, which I think is at the heart of what Cole does.
Also, it's true that we don't have any substantial confirmation that what actually happened was what we think happened, we're going on very slim information that mostly comes from Cole himself, who has a peculiar way of expressing what he sees in the world to begin with; point being, there's nothing to say that Solas didn't use a completely benign magic on Cole to keep him (temporarily or permanently) away from the dangerous things Cole might have been exposed to in his mind, thus it's not a stretch to think that Solas did indeed act completely in-character.
Solas and the Orb. Alright! This is a nice subject to speculate about. I have been wondering about this whole "Corypheus unlocking the orb and dying" plan that we assume as one of the most likely outcomes that Solas tried to orchestrate and this ties in with his regard for "the people."
Firstly, I'm not entirely convinced that Solas means elves when he says "the people;" in fact, I'm not even sure that he is referring to ancient elves. It is true that his demeanor seems to shift throughout the game and after the Arbor Wilds it seems like he is genuinely moved by the ancient elves we encounter in an odd fashion, but I think that this isn't the whole truth. I think that Solas has been clinging to an image of who the "people" were way back when, before he did whatever he did to the Elvhen gods, etc., which might be related to the "people" known as gods to the Elvhen, or the Elvhen themselves or even including the "people" of all Thedas, including dwarves and humans. His lack of concern for modern elves would indicate that he does not feel on an equal footing with them, they are not his people really. So in reality, I would say that Solas never stopped caring, yet he never grew to care for the modern "people." Remember, he wanted to unlock the foci before he joins the Inquisition, before he has any chance to revise his opinion about the Dalish and the city elves, i.e. whatever his plan regarding helping "the people" predates all of these events.
Secondly, isn't it odd that Solas didn't expect Corypheus to live through trying to unlock the foci? Not to mention the fact that I think it very strange how the foci gets to Corypheus in the first place - was Solas aware of the fact, then, that the Grey Wardens had been keeping an ancient magister locked up? Did he learn about his escape from those depths and his apparent immortality, since Hawke's destruction of him didn't work? When Corypheus has such power already, how is it possible that Solas would not suspect that he has the knowledge and willpower to unlock the foci and survive?
So, the fact that Solas seems so surprised by how things turned out would indicate to me that he was unaware of Corypheus' true nature, which means that he could not have planned for him to "stumble across" the foci or something like that. Rather, it may be that Solas was simply seeking someone - anyone - with the right amount of ambition and ignorance to attempt to unlock the powers of an ancient elven artifact.
Another thing to consider: if Solas was aware of who Corypheus was, how is Solas surprised at his almost-success when he already knows about what ancient Tevinter magisters managed to achieve by entering the Fade and causing the Blights? Even if he was asleep at the time, surely he must have realized that those magisters possessed strength and knowledge that is comparable to what he and the other "gods" possessed when they became gods if they were able to do such a thing.
Finally, why did Solas need the foci unlocked and how did it become locked in the first place? I think this a particularly interesting question. I think it clear that Solas wants to undo what he did. He locked the gods away and then he realized centuries later that he made a huge mistake with his little liberation plan that caused the downfall of the Elvhen among other things.
My theory is this: he locked the foci himself, not just his own but that of all the gods, just so that no one could abuse that kind of power ever again. It fits with his revolutionary attitude. He locked it in a way that no one, not even himself, could unlock it again, or perhaps keyed it so that the foci belonging to the individual gods could not be opened by the hand that the power belongs to, i.e. Solas cannot open the Fen'Harel foci, but someone else could. (Like a plan B that he never actually intended using.)
In short, I think this is a case of locking your keys in the car so to speak. He wanted to get rid of both the opportunity and the temptation and now realizes that this is the only way he can get himself out of this fix after all, i.e. he has to reverse-engineer his own plan. If he made such a contingency plan such as locking himself out on purpose, then he would have started to hunt for someone who has the willingness to do what must be done, and I'll bet that he planned on providing just enough information so that the person doing the unlocking would have the right skill to open it, if not actually use it. The fact that Corypheus pops up is like divine misfortune combined with a blessing: the orb is unlocked, but the price is too high and it backfires anyway.
The DA2 cast in general get fandom hate for being their crazy selves. Which I think is a shame, because the polarizing nature of the characters is what I love about them.
The worst characters aren't the ones that inspire hate. The worst characters are the ones that get a "meh" in response. Characters that inspire extremes of emotion are IMO the most interesting ones, and it's perfectly possible to hate a character, and still appreciate their power as a character. Casavir from NWN2, for instance, though that's an Obsidian game. F***ing hate that guy. Still think he's a great character.
I agree with this profusely. (And I hated Casavir, too, haha, for all the right reasons!)
This is why I think Anders is one of the BEST characters! It's such an epic and symbolic muddle in that man's head, it's simply fascinating. If I ever get around to posting my character analysis article somewhere I'd get back to this subject.
*shuts up now*