I would say that while some martial arts train one to be violent, others "explore" violence. That is, they explore the violent nature we all possess. Aikido, I beleive, is one that "explores" this. By understanding where violence comes from and how it can be expressed, a person can move in their training beyond violence. Again, I believe this is the goal of Aikido.
janet dtantirojanarat
www.warriorwoman.org