Normal response to aggression is fight or flight. I can understand how some people prefer to run if there's trouble. However, with the ever expanding safety nets afforded by society I see less and less people confident enough to give a scumbag what they deserve.
Want to stab innocent people? I think you deserve to have your face crushed with a manhole cover, and then nobody should call you an ambulance. Not by the cops, it should be some random stranger who does it to you. That way you can be surprised, like your victim.