Do you guys "blame" Wynne for her good acts? She had a spirit of Faith inside her - did it make her good? Or was she good - and she kept the spirit of Faith pure?
Wynne's spirit isn't much like Anders. It doesn't really seem to talk to her or anything like that, she can just feel its presence. It just brought her back and now seems to be fading. With Anders, we can tell by the glowing blue eyes and lines on his skin whenever Justice comes out and we can feel free to 'blame' the things that he does while in that state on Justice. Anders himself denies that it was Justice that made him blow up the Chantry and that he and Justice are the same person. And yet...Justice actively steps in and prevents Anders from changing his mind. I think Anders is on-board with it to some degree and yet Justice won't let him do any different.
And yes - he was responsible - interesting that his father sends him to Tevinter and not a Circle at the end of Origins.
Actually, he DOES get sent to the Circle and then years later goes to Tevinter.
He lied so that you wouldn't stop him. He did not protect Hawke, he made him/her an accomplice. The fact is, Hawke IS less important to him than his cause. Everything in the world is less important to him than the cause, including Hawke, himself, and even other innocents. He's very "end justify the means" about it.
You're certainly less culpable than if you knew what you were doing but I remember Sebastian turning to Hawke and demanding "You HELPED him?" when Hawke yelled at Anders about being used to distract the Grand Cleric.
I stand by the fact that spirits are just "ideas personified". They cannot do anything that a person wasn't already willing and capable of doing.
The spirits define themselves based on the ideals that they value. Justice had already decided that he was going to devote his existence to the cause of Justice before he had even met Anders and was the one to first call Anders on the fact he wasn't doing anything to protect the mages long before they had merged.