Flee or fight. I've got too many problems that keep me from running. The option left is to fight. I make my living with my brain and my hands and don't plan to damage either. I've never started a fight, but I finished every one of them.
When my wife is with me, she can't defend herself. It's my job to make sure no harm comes to her.
The police investigate crime. It's not their job to prevent it. You are your own first line of defense. If someone is dumb enough to take their fists to a club/knife/gun fight, they have other mental issues.