This is an excellent discussion and I'm glad that it has mostly focused on the OP's original intent (LEO training).
I do think that maintaining the 4 rules of safety should be at the very top of the list. Even if I were killed in a gunfight, I would not want one of my bullets to have taken out an innocent bystander. But that's just my priority.
I've learned a lot here.
Mediocrity dominates over excellence in all things... except excellence.