One case that irritated me was Columbine, where SWAT sat outside for 3 hours until everyone was dead, then marched the survivors out as if they were the criminals.
I’m sure they were just following some kind of policy, but it irritated me to no end.
I agree- that was utter cowardice on their part. In a situation like that, protecting the officers' lives should have been secondary to trying to stop the shooters. I remember watching that and screaming at the television for them to go into the school.