. Another school shooting. Another Mass murder of innocent children. They were elementary school kids this time. There were 18 children killed—so far—this time. . The fact that I can say "this time" is enraging, but that's the routine nature of Mass Shootings in the U.S. It happened in Texas this time. At least three adults were killed this time. The shooter was a teenager this time. The details this time may be different than the last time and the time before that, and the time before that, and the time before that. But there's one thing all mass shootings have in common. No, it's not mental illness. It's not racism or misogyny or religious extremism. It's not bad parenting or violent video games or lack of religion. Some of those things have been factors in some shootings, but the single common denominator in every mass shooting is guns. That's not a secret. It's not controversial. It's fact. The only thing all mass shootings have in common ...