Isn't there a guy in Tulsa that is in the hospital in serious condition because after the BGs robbed the fast food joint, the clerk complied, then they gut shot him anyway?
Its not always a matter of saving some cash for a store owner, it can boil down to are you willing to inconvenience yourself to possibly save a strangers life?
Well ... when you put it that way ... the short answer would be "no". Being placed under the scrutiny of law enforcement, the media and the DA's office, not to mention the ambulance-chasing attorney the dead bad guy's family is gonna hire to sue you in civil court for wrongful death are not "inconveniences" ... However, I will admit YMMV ...