They generally do not give lifeguards, firefighters, and first responders firearms and instruct them to kill the survivors if they feel like their life is in danger.
They don't tell them to directly kill anyone. Because very few people attack firefighters.
Indirectly, however they do recommend that. If the burning building is very dangerously unstable, firefighter SOP is not to enter to try to save anyone who might still be alive (nor permit others to do the same).
It's not very often those people are being attacked on the job though, seems like the right analogue would be training on when to let someone in danger die. Having went through lifeguard training the very clear message was that if you feel unsafe in a situation or can't subdue someone who's dragging you down you preserve your own life first.
"Tragically, Magdiel never heard the police commands - because he was deaf. During the stand-off, neighbours shouted to the officers to tell them this, but they shot him anyway."
