There are tankies in this very post doing this very thing. You saying “strawmanning” is just deflection and denial, just like how your favorite authoritarians deal with this day in history. Just deny, deny, deny.
911, and ideally they would alert a tactical response team with a negotiator to get on a helicopter while they gather details and form a plan in transit that would reflect their training for these situations. Have four of these teams in each state. police cordon off the area and monitor the situation to keep the team updated while they are in transit and to watch the entrances and exits while the staff that were already in the building, including resource officers, would be doing what they could to get people away or get them to the safest place they can. Police force as an intervention would be a last resort scenario, as escalation in these situations will only guarantee more dead. The police have no obligation to protect or serve under the current laws, they are not required to do fuck all, they should not be the people you expect to save or help you, they only exist at this point to punish you and bind you.
That’s why I went with being a warlock, sold my soul for rock and roll.
Should have gone for magic, though, turns out rock and roll is very accessible without making a bargain with a demon.