If local police are going to try to support a quasi-military arm without looking like keystone kops, they should be at least as savvy on war scenarios as our actual military is. You want to “negotiate” with a guy who has been shooting innocents down in cold blood for no reason? Mais non.
Prior to Columbine the doctrine made sense, just as the non-resistance to hijackers did before 9/11.
It isn’t fair to blame people for not anticipating a change in tactics by the enemy. Especially not the on-the-ground cops. If blame needs to be assigned, it should go to those who ordered the SWAT guys to follow what was rapidly becoming outdated doctrine.