> this should logically be incredibly low on our priority list.

0.00006% every year...

Why should there be a priority list? Why can't we improve multiple things simultaneously?

> we solve this by raising the gun purchase age to 26, because this is mostly school-age children shooting younger school-age children

This won't solve the problem. A Secret Service study of school attackers (2008–2017) [1] found that "Many of the attackers were able to access firearms from the home of their parents or another close relative."

[1] https://www.secretservice.gov/sites/default/files/2020-04/Pr...