[FireBeyond]

What range training features people who are bent on killing _actively shooting back_ at you?

_You_ don't want to harm anyone else, you only want to protect yourself (and possibly others). They have no such compunction.

Being able to put a few downrange with a Glock is not an active shooter situation, and honestly, as a first responder, most people in such situations find themselves vomiting, urinating in terror (and reasonably so).