Somebody walks into the store and starts putting rounds into the ceiling.
1.) I'm not going to approach him and give up real estate I already own walking into the unknown. (My job as a Civilian is not to arrest or confront its to protect my backside)
2.) Somebody threatening with grave bodily harm/death should get a little medicine maybe a couple Pb prescription pills, with added Cu as a bonding agent. They don't need to be reasoned with.
In all honesty the cops well there really is no amount of training for what happened to them. The only solution would be separate from everybody except other cops, only eat with cops, only hang out with cops, only do everything with cops. The problem is community policing goes down the drain and we get a real "US vs. Them".