Put the question another way, what would you do if it was your kid?
I think every parent here would jump in without thought for their kids. That is because parents love their children. The desire to love and look after has become instinctive.
This was the underlying point of this thread. We won't jump in for that guy....because we do not love him. We do not instinctively love our enemies... when we should. Christianity 101 = love your enemy / do unto your child, friend and enemy as you want done unto you.