I agree - money isn't worth killing (or dying) over - but there are a lot of posters who disagree.
The money isn't the thing. This thug has all the value of a cockroach and should be killed with about as much forethought.
The only concern that should be given him is just enough to make sure you have the right person.
That's why concealed carry works: No one will ever be as certain as the potential victim looking down the barrel of a gun.
It depends. If I can manage a way to shoot the thug then I'll do so. The thug though has no honor and can not be trusted.
You have to be almost neitzchian when dealing with a thug.
I think most would agree that the money isn't worth dying over, but saving the life of your girlfriend as well as your own from the criminal punk holding the loaded 9mm is worth killing over. That's the real issue, not the money.