I mean all child mortality stats are shotty, because they're about kids dying.
But the short version of it is that the largest segment of kids dying to guns is them being accidentally shot in the same demographics whose adults make up the largest slice of shooting homicides (in both perps and victims) - minority (especially black) inner city communities.
The reasons are likely related - if you're in a demographic where you're more likely to shoot or be shot you're more likely to have a gun around that's not well secured, which means you're more likely to have accidental shootings too.
Because English is a Germanic language that has half of it's vocabulary as borrowed words from a Romance language (French) that then got chewed up and mangled for a few centuries.
Not like Gaelic, which has to own the fact that most of it's words are pronounced in the least sensible way one might think that series of letters is said.