So what? Garrulous extroverts kill to. Just listen to Charles Manson run his mouth in his many interviews. There is no rule that says killers and rapists are a certain way and neither is there a rule that says loners/introverts are always harmless. It's when we focus on shy killers that it becomes easy to think there is a correlation, as illusory at it is.
"To hell with reality! I want to die in music, not in reason or in prose. People don't deserve the restraint we show by not going into delirium in front of them. To hell with them."