It's also perfectly valid to be realistic: the reality is they are exceedingly rare. That's it. You don't need to check all the Halloween candy.
The difference here is that Halloween candy being poisoned is urban myth ... and school shootings are real experience.
The fact is, kids are having active shooter drills in schools.
200 kids have died in school shootings
200 kids have died last month in Chicago.
Come on.
The two tragedies don't have comparable psychological impacts. If all we cared about was minmaxing deaths, we'd work on nothing but CVD and automobile accidents.
And, of course, the number of kids shot in Chicago last month doesn't even resemble 200.
Moreover, actually in USA deaths on roads went up
Moreover, there is large overlap between those who see mass shooting as issue and those who want walkable streets and the kind of zoning that promotes less driving.