One word, NO. It seems counterintuitive, but actually kids often become less violent as a result of marital arts training. It’s a method of channeling and relieving aggression, while at the same time increasing respect and care for others.
While we teach kids to be more tough and confident, it’s all in the name of self-defense and as a last resort – not as a weapon to attack. By learning self-defense they gain a better understanding of themselves and those around them, which actually promotes more peace for all.