I've hinted at it before, and I'll hint at it again... I think some honest-to-Gawd reality may be slowly soaking through the porous brains of the Lefties.
At least some of them.
Think about the last couple incidents. In Florida, armed police were real close, but didn't attempt to go in and stop the shooter. In Santa Fe, TX, the police rushed and attacked the shooter quickly and one got killed. In both cases, multiple students still got killed. The only group of people who would be nearby just about any time are teachers.
At some point, that information has to sink in that calling 911 isn't the only answer or the best answer.