I would suggest the security issue is also a band aid proposal. Even a red herring. The big question is why in 1930s, 40s, 50s and 60s when many kids took their guns to school, we did not have school shootings like this. There are plausible answers for this by way of an objective examination of those involved.
There are a number of common denominators, and some of these were almost non existent in the 30s, 40s, 50s and in the early 60s.
Without any objective causation analysis it is down to band aids. And rather than focussing on security of guns at home, a more practical band aid would be security at schools.