Killing people because they steal a buck or 2 from you is just barbaric and uncivilised. That is why we have cops you savages.
Don't you value human life? Do you really think 10 bucks is more important than a human life?
I mean ffs, that is why murder is so rampant in the states, you kill each other over nothing, you just have to look at somebody sideways and boom, there goes your head cause pride is more important than life.

How do you even know the gun is real? Maybe it was just a confused teen in despiration, does he really deserve to die for 1 fuck up? Was your life really in danger? If you had just given him his money you would still be unharmed, the only thing that chances is that a human being gets a second chance at life.