Baby Boomers

"is there a trend toward 60+ would-be mass murderers? Two is not enough for a trend, but it may be something to keep an eye on."

And a light bulb went off.  If it is a trend...

When these shooters, Paddock and Hodgkinson were 20 something, the murder rate was peaking.  Their co-generation were the young men committing crimes at a record rate.  Then that generation aged and slowed down and mellowed and the next generation didn't take up the violent-crime slack.  Crime rates fell

That age group and crime.  Connected.  Now some hangers on from back then are making one last splash

Was it all the lead in the paint and gasoline making them superviolent?  That stuff is persistent.