And who gives a fuck about the weapon used. That does not excuse their lack of action.
Pistols don’t beat AR15 rifles. If the opponent outguns you, you need to wait for backup and bigger guns. Basic tactics.
And if everyone is using big guns during a hostage situation, the “Good Guys” have a huge disadvantage due to the penetrative effects of powerful guns. Good Guys don’t want to kill children with missed (or even hit) shots. A headshot vs the shooter would not only penetrate the shooter’s skull, but also the wall behind the shooter. A wall that you’re not sure if the children or the teachers of the school were hiding behind yet.