> once in the situation, a reasonable person could have feared for their lives.

Sure, all things being equal, a person on the Clapham omnibus, yada, yada.

However, specifically in this situation it is very frequently not "median people" in the mix, it is LEO-phillic wannabe (or ex) soldier types that are often exchanging encrypted chat messages about "owning the libs", "goddamn <insert ethic slur>'s" and exchange grooming notes on provoking "officer-induced jeopardy" .. how to escalate a situation into what passes for "justified homicide" or least a chance to put the boot in.

Those countries that investigate and prosecute shootings by LEO's often find such things at the root of wrongful deaths.