Of course they do, why would you infer that? But continually making excuses for somebody who behaves badly and doesn't learn from their mistakes is very naive. Its how you deal with your problems that matters, not whether you have them or not. I don't know the ins and outs, neither do you, but to absolve him of any blame is ridiculous.
The current team spirit is said to be the best ever, with players from all walks of life coming together and (appearing) to really enjoy their job. I see no reason why he wasn't welcomed with open arms. Poch is a great leader. By all accounts they have a way of nurturing players (look at the academy etc). He didn't enjoy being part of it, got his move.
Before anyone accuses me of being a fascist, unsympathetic or knee jerk I think that people with aggression problems should be helped and have a lot of respect for them when they do cope. But I cannot believe that saints would give up on such a talent and investment unless he were a lost cause or not helping themselves.