https://en.wikipedia.org/wiki/Trial_of_Scot_Peterson
https://www.nbcnews.com/news/us-news/parkland-shooting-verdi...
We assume that the police will come to the rescue for all situations, but the fact is, they're human too.
This is typically different than the pro-gun mantra of "The best defense from a bad guy with a gun is a good guy with a gun."
He was clearly a good guy. But he didn't want to die.