Remember this: If Criminals were Honest and respectable people they’d have honest or respectable jobs. You cannot enter a social contract with them no matter how much of a starry eyed idealist.
If somebody says “Give Me your wallet, or I will kill you” they are JUST as capable of killing you AFTER they get your wallet as before. Same goes for any other robbery situation, and any property that is yours, your employer’s or an associate’s.
There's one better in his post though. It's his answer to the question "What would you do if you're robbed?"
I won't spoil; just follow the link.
Edit: I will say that it's a technical exaggeration. In a similar situation my response would be less pithy but the result of stopping the threat? Hell, yes.