Several observations...
How can 7 people be arrested if the guy was killed with
ONE knife? Unless the other 6 held the guy down...
I guess France has no right to personal self defense either. Sure, one could argue that they should have handed the money over, but who's to say he wouldn't have shot someone anyway. In this day and age, compliance doesn't equal safety.
I guess the robber never heard the old adage about bringing a gun to a knife fight.