I totally agree with you! A little story: A guy I knew has been bullied for nearly two years by this one (older) boy. He's been practising TKD for nearly a year Last week the bully started getting in his face and pushing him, so he punched him in the throat. It wasn't a "lost-control" punch either and as soon as he went to the ground the guy walked away. Now his parents have pulled him out of TKD and he's suspended from school for two-months (they initailly discussed expelling him..) Now, to answer your question. I don't believe martial arts has anything to do with making a person aggressive. As lordtariel pointed out, when a person stands up for themselves they can be labelled "aggressive", and while I know that there are some real ego-jobs in the martial arts, from what i've seen they're usually aggressive before beginning martial arts and usually start training because they like the "tough" factor or to learn how to beat the crap out of someone (who is usually smaller than them).