Anecdotal but related: My grandfather shot competitively and as a hobby for most of his life (mostly skeet, occasional trap and pistols). Until the 90's he also taught gun safety and competitive marksmanship at a (comparatively very wealthy) area high school. He was dropped from that role as a knee-jerk reaction to the Columbine shooting, as it was deemed "too dangerous" to allow guns, even well controlled and in professional hands and for the purpose of teaching safety and responsibility, on the school property.

I don't know how this played out in the rest of the US, but I have a feeling that there aren't many (if any schools) that allow guns on their campuses, even if for the sake of education.