He's doubled down because no one else has a more sensible idea that will actually, and immediately, make schools safer for children that are forced to go to them.
A lot of folks here are for gun control because they don't like guns, and they don't like the NRA because it's a GOP interest group. They really don't care about the safety of schoolchildren because they're now out of high school, but they don't have kids to think about yet. It's mere politics for them now. For some of us, however, this issue involves thinking of the safety of lives we are specifically responsible for. We're playing for keeps, not just to win an argument that will help our favorite candidate win.
This is ridiculous. High school students don't care about their own safety? Come on.