While I think you and I would agree if I argued it was more about culture than firearms per-capita, it's pretty hard to say children aren't suffering some pretty real harms from said firearms (to say nothing of adult suicide statistics when firearms are kept in the house)
Reducing the number of guns doesn't solve the root issue (which I think we'd also agree on), but it should minimize the harms while being dramatically easier than changing the American ethos. Hell, America could likely get 80% of the results (no school shootings) with 20% of the effort (additional restrictions on firearms, more akin to Canada)
I further think the second amendment is causing Americans more harm than it's worth, though that's a seperate discussion; some examples include suicide statistics, accidental discharge, a lack of protection even when carried legally (such as in Alex Pretti's murder) and the fact that, when firearms could be anywhere, police must treat every interaction as potentially fatal - with all the force that requires
