For all the debate about Loghain, there really isn't any valid reason to see this guy in a good light. There just is not. Just the fact that he turned his troops in battle is questionable enough. Leaving the field is very questionable. The raging debate over this is where people will say it couldn't have been won based on what we see almost shows signs of insanity on their part because all we see is a hoard attacking and we don't see how many troops Loghain has because we are narrowly focused on him and his command to retreat. Not one thing there tells us it was not winnable. It's speculation at best.
Then we have Jowan telling us loghain told him to poison the arl. Loghain fans debate this point and say Jowan is lying or it wasn't loghain. Well, I'm pretty sure there are paintings all throughout ferelden of their greatest hero general. I have zero doubt about that. And I'm pretty sure that Jowan has no reason to poison eamon as all he wants is freedom. That's all he ever wanted. His actions in the tower were stupid but they were all with one goal in mind... freedom. Poisoning eamon is one thing that would not grant him that for sure. So there's not logic in that argument. And to say it was an imposter... that is sort of a desperate excuse. We see loghain hire assassins to kill us. We know there is a bounty on us. Why would we start speculating that he isn't tied in to all this. For the writers to say 'oh no that wasn't the case' just makes it horrible writing. It really just shows how awful they are at their job to make that a red herring. We already know loghain was going to be indoctrinate at one point but they changed it. Fact is now we've headed into ME3 ending territory because there was a different ending slated but then they changed it and that change threw the whole thing off. If loghain was slated to be indoctrinated then all his actions were going to be bad guy actions. This means that the writers shifted gears last minute, just as the did with the end of ME3 because there was a story leak and now they decide to make loghain not indoctrinated but also they didn't want him to be bad on his own. He was meant to be a victim. Ostagar DLC is another justification for his actions. They are trying to paint themselves out of a corner. They are working really hard with those Orlais documents and maybe a divorce to show loghain as justified. It's audience manipulation and you see it throughout the game working overtime to make things look less certain of his involvement. Likely there were more scenes cut regarding loghain like probably one where he meets Jowan because now they want to show the hero as less evil once they get rid of the indoctrination and as a result it's shoddily done. Throw in a few men at the gate of Orzammar and it looks like he's really trying to raise an army, but it's still weak
This is what happens with every even action that paints him badly. People argue these points and even debate his level of involvement then justify his actions. But really they should be considering that they've been cheaply manipulated by the writers because loghain was going to be indoctrinated and so his actions were all going to be bad guy actions. But the writers changed it only they couldn't change set pieces. That requires too much writing. So now they have to make them look more vague because the last thing the wanted was for him to be a straight out villain. So they beef up this Orlais bit. Probably to that end I think they thinned out the Warden forces. Those are easy changes that shift things. People who defend Loghain just don't even realize how they are being manipulated. If you take this change into consideration, you see that it was all loghain, but now they go back on everything and make it look 'questionable' and then get behind him not being a bad guy. Sure they can do that, but they have to make those set pieces look less stupid to those of us who see there is something not right with them and that they are illogical.
They couldn't change the set piece of Jowan so now it's become a 'questionable' event as to whether it was loghain or not. That is debated, but it's not logical.
People fall for it, hook, line and sinker but all they are falling for is writers who decided they didn't like the indoctrination idea so they removed things that were definitive while not really making all the set pieces still have some kind of sense or reason to them. That's bad writing. You change something big like that, you HAVE to alter everything accordingly. But they couldn't. So they left it questionable then later say 'oh that wasn't it'.