I don't agree. Draw your gun and kill the thug first is how it should have went and would have went if NYC didn't effectively disarm their citizens. Perfect example of being unarmed, you are at the mercy of any a**ho** with a weapon. I would bet that this guy would have shot someone anyway, he was just looking for an excuse to show off to his homies.
That's my rule for dealing with a mugger when unarmed. Please see my other posts on this thread and you will see that we absolutely agree.
To say nothing of the thug still being at large and there are potential future victims down the road. It's a civic duty to neutralize a criminal.