It is easy to criticize the police, but there was one shooter, and only 19 police officers. Surely they were not competent enough to stop him?

I'm sensing sarcasm. Maybe they all knew him from school and just knew what he had gone through; maybe participated? In any case we need better vetting of police officers for prejudice, attention-span, looks like; and school shooter protocol/general preparedness, Maybe critical thinking/acting under pressure. Sometimes you have to do the right thing despite what a ranking officer says.