1) Please do not tell me how to play a game. I can play however I want, and just because your views don't match mine doesn't mean you can dictate your opinion to others.
You can play the game however you like, because the game is a private experience. But if you come on a public forum and make false judgements using all your hindsight which you have gotten from finishing the game to judge a in-game character that makes a decision reflecting the immediate situation be prepared to be called on your fallacy.
2) You have repeatedly shown in this thread not to have picked up some in game information or misinterpreted it. So I'm going to take every opinion of yours on the game with a grain of salt.
Ditto. People have different perspectives but I haven't said anything outright false. You raised the issue of what happened to Tranquil in Oculara codex, I said no one knows and there is no mention of the in the game. I was right there is no verbal mention of it at all, only in a single codex and on a side quest. That can and does easily imply no one except PC knows about it.
3) It does not "go without saying" that the Fereldan ruler(s) would not appear without the Inquisition being there. Do you have a source for this? We do know that if the Chargers investigate Redcliffe if we do CotJ, the magister and mages have abandoned the castle. Not proof either way whether the Fereldan ruler came to Redcliffe. If anything, I assume the timelines for IHW vs. CotJ are the same except for the Herald's involvement, so everything else in the world still happens the same.
The events of hushed whispers take minutes to happen, the Inquisitor and Dorian are sent in time but they return to that exact moment and clearly with that the time magic manipulations end there. Are we suppose to believe not a single soul not even Inquisition itself was aware of the marching army towards Redcliff? If you have a better explanation I'm all ears. The army literally comes out of nowhere. Venatori spies did not detect them, Leliana did not detect them, no one did. They appear soon after Alexius loses the amulet with which he casts time magic.
As for mages and the charges report. There are some Venatori inside Redcliff performing a ritual, and we know damn well where the mages are. They are marching on Haven. When there is no report of an invasion its far safer to assume the invasion didn't happen because I'm sure we would hear about an invasion of that size. Because we hear everything that happens to Templars if we side with mages, why should mages be different? With the evidence in hand everything points out to there being no invasion, unless you use the hindsight fallacy again and count the information you have from another playtrhough in which you sided with mages. This is usually a fallacy, more so when time magic is involved.
4) If you've listened to ambient dialogue in Redcliffe and some conversations, you would know that no non-mage in the village feels safe and secure. Many have already left because of Alexius.
There are many various ambient dialogues. Some agree and some don't. I just found one by opening the game and listening. This is two mothers talking about the situation in Redcliff, with the conclusion being:

So they are in fact safe, and I didn't say anything wrong. As far as Templar attacks are concerned, Alexius provided a safety Teagan failed to provide.
5) Why would Teagan remaining in the village make more sense than him going directly to Denerim to petition aid from the monarch? His small amount of guards caught unaware would be much less effective than a contingent from the capital who knew what they were up against. Teagan making a symbolic but useless gesture by staying in the village isn't going to help anyone. And who is to say that when Alexius forced Teagan out that he didn't make sure Teagan left the Hinterlands completely? Why would he kick Teagan out of the castle but then be fine with him chilling in the tavern?
If he really had that small amount of guards, then there is another valid reason for Fiona to accept Alexius's deal, which was the main discussion on this thread. Teagan failed to protect the mages and his people from Templar attacks, and later a few Venatori ousted him from power. He could have made a last stand like he did on DAO, Venatori do not have unlimited number like the undead and they die much easily. But he didn't have a real title to defend back then, did he? in DAO He cared about people not his riches in the castle.
6) How does you being made at Teagan for being rude in Trespasser present any evidence that he was only interested in regaining power and not protecting his people?
If you complete in hushed whispers he has every reason to believe Inquisition is there to help. But that statement is true in case of siding with Templars. Because Templars have pretty much invaded ferelden and Inquisition helps and rewards them.
7) I'm not saying the mages would have necessarily needed to perform search and rescue for the tranquil, although that would have raised my attitude toward them. But you said "I'm not saying its a good thing that no one cared, but with circles gone they are not really useful to anyone, they cannot even fight." Emphasis mine. This is essentially providing an excuse for why someone who is not "useful" is justified in being ignored.
Its not just the mages, according to various sources people literally get cringed around the tranquil, not to mention the tranquil are no longer counted as mages and they may leave the circle anytime they want. I was not talking about morality of this, but the facts of mage-tranquil relation. With few exceptions with Minaeve being one of them, the mages completely ignore the tranquil whether they are inside circles or rebelling outside of it. It was the tranquil's decision to follow them, just like it was their decision to stay in the circles when they could clearly leave.
Mages are the ones who made the tranquil tranquil. They used to be fellow mages, possibly friends. So it is the responsibility of the mages to take care of the tranquil, and it's very likely that some mages would be just as emotional with former friends turned tranquil as they would with children. Think Maddox or possibly the relationship between Jowan and a mage!HOF if they're friends.
No, majority of mages vehemently oppose tranquility. The Chantry and Templars made the tranquil, so the responsibility falls on them. Its them who take away their emotion and with it capacity to function like an actual human/elf. Some mages would feel emotional, as I said there are exception, but the majority don't and see them as lost causes at best.
Morally, the Circles can't lobotomize the tranquil and then not be responsible for caring for them, especially since the tranquil can't really live independently. Minaeve tells us about this.
Except the circles were an organization under the control of Chantry, mages were just part of it. They didn't have a say in most matters. Its like you are blaming the citizens for a situation the government has created. In this case the citizens are the mages, the government is the chantry and Templar enforcers with circle being the country.