Killers aren’t stopped by these policies
“After a shooting spree,” author William Burroughs once said, “they always want to take the guns away from the people who didn’t do it.”
There are a lot of problems with this approach, but one of the most significant is this one: It doesn’t work. One of the interesting characteristics of mass shootings is that they generally occur in places where firearms are banned: malls, schools, etc. That was the finding of a famous 1999 study by John Lott of the University of Maryland and William Landes of the University of Chicago, and it appears to have been borne out by experience since then as well.