I've seen a trend recently in people claiming shrooms have made them aggressive and I suppose anything can happen. Google "(forgot first name) Wyatt mma killer" some wanna be mma guy killed his buddy and gutted him while on shrooms.
I've known, been around and taken a million shrooms and only seen/felt happy and high. I don't get it at all unless it's people who are prone to violence to begin with. Heaving said that. It's a drug like any other that will destroy your life if you let it