Hmm....
AS boosts your strength, endurance, recouperative abilities. All of this makes you feel pretty good.
Agression isn't a direct effect, but rather a result of physiological response. When you feel good, you often engage in things that normally you'd not be inclined to try. So, in that way you're more agressive.
As far as being a bully looking for a fight, that's all in what's your nature....don't blame the gear for lack of self-control.