I would tend to agree, but mostly in regards to modern American society.Truth of the matter is that most people are pussies and will not do things that place themselves in serious danger in order to help others.
I can't speak for anyone else, but I know I would have done something. Throw a chair at the bastard and rush his ass. He's a little azn dude...I'm sure that everyone on DP would have immediately jumped into action, disarmed the attacker, tended to the victim's wounds, and then decapitated and crucified the attacker (to show we mean business!), but in the real world, most people are just going to be concerned about themselves, regardless of age or whether they "have testicles."