>I don’t know what else the bar could do, except maybe have a blinking neon sign brought to put over the good guy, to tell the trigger-happy cops not to shoot.<<
Bright Green safety vest with “SECURITY” emblazoned on it would go a long way.
I’m guessing this security guard looked pretty much like the patrons. Not that it should matter, but when you call the cops, you have to expect they will assume everyone is a bad guy.
Yeah, we can't actually expect cops to use any actual judgement before they open fire.