But… read the guy’s write up of his data set and methodology. He cherry-picked cases that fit his own definitions and purpose:
Suicide presented a tricky variable in the analysis. Roughly half of the remaining rampage shooters ended their own lives. So, I removed all incidents where the shooter killed themselves before police arrived…
He undermines his own point here. The argument that an armed citizenry could have stopped these crimes falls apart: nobody stopped the sprees until the killers killed themselves.
I’m posting this not to be combative, but because we’ve got to start with well-founded arguments if we’re going to have this conversation.