[Hulka]

Thought experiment: The bad guy killed the deputy and running away. The security guard stops the bad guy from escaping.

Should he be fired or not?

[Bigtigermike]

He would be fired according to Best Buy stupid rigid policies. I’m amazed some innocent people hasn’t gotten killed with a criminal running them over or knocking them into hard fixtures and employees just stand there doing nothing

[thefactor]

SHOULD he have been fired at all? Not in my view. But I'm also not going to tell a private company how to run their business.

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.