You had a terrible, personal experience that is not the norm. Many drug addicts are damaged, sad, depressed people who are medicating away their own personal pain. I would venture to say that alcoholics and addicts many times, without their addictions, are hyper-sensitive people who have been injured by life and are searching for relief from their pain. The group you were describing must have been on one of the violence inducing drugs and were truly dangerous. But most addicts are looking to "be happy", not to harm others.