Don’t need a study, there is always a copy cat killing after a mass shooting. We have witnessed it escalate since Slick Willie. The schools shoots most certainly.
We (conservatives) don’t need a study to figure that out, but a study is absolutely needed if you want to demonstrate that to a leftist, or even moderates. They won’t take our word for it, and if they could draw the conclusions we draw from simply watching the news, they would already be on our side.