In your "what if" scenario, the suspect kills a cop which means he would have no problem killing some random security guard. A citizen has no obligation to intervene in a major felony involving a weapon.
“In your ‘what if’ scenario, the suspect kills a cop which means he would have no problem killing some random security guard. A citizen has no obligation to intervene in a major felony involving a weapon.”
Indeed, no obligation, but if he decides to act and bravely takes that risk he is a good man willing to take risks for the protection of others. That sort of character is too often beat out of young men. Being a sheep-dog is no longer allowed (hence his firing), but being a sheep is.
I blame lawyers and SJW.