An important distinction for sure, though I had assumed the opposite, which is that the GP was in disbelief that adults can bring guns to U.S. schools (and that

An important distinction for sure, though I had assumed the opposite, which is that the GP was in disbelief that adults can bring guns to U.S. schools (and that it's totally obvious that children cannot). When you're discussing our gun laws with foreigners, I guess you're right that it's always necessary to spell out the fine details, like the fact that we have separate rules for gun-toting people who are over 18 and gun-toting people who are under 18, because from their perspective it's almost certainly just one big jumble of insanity.