I was a deputy sheriff .... We trained and planned / responded as I stated .... Active shooter, especially a school.... Never wait, inform dispatch as to where your making entry, leave your siren and lights blasting, gun up and start kicking doors , triple tap center mass anyone that refuses to drop their weapon.
Very simple, noise, run and gun to stop the threat or make them try an escape their killing ground
Anything less is bullshit as you state. PC be damned. Even sheep need sheepdogs.
Stay safe buddy... Hope yer well.
I wish it was that way in California, but from what I've seen here lately, I'm not at all hopeful. It seems to take two cruisers to make a simple traffic stop these days, even in suburbia.