I think the gist of banana's argument is:

1. The cops are already in the school.
2. They are being trained to do something useless, like how to talk to kids, when they could be trained to do something useful like how to take down an armed maniac.
3. fixing the problem is a matter of changing priorities, it doesn't have to cost more money.

How about all the training of armed teachers then? Do you just take them off teacher conferences and instead put them on SWAT training?