I did find ironic that the teenage protest is tied, to a degree, to Trump's consideration of denying certain gun ownership privileges of that very group - the 18-21 year olds, anyway; that said, people in that age group are the most likely to be slaughtered by some nut job their own age on a high school or college campus.
So maybe that's it. Maybe it's a risk reward thing. Maybe a whole lot more of them would exchange a privilege that likely almost none of them would use - I know I never had any desire to go out and get a semi-automatic assault rifle when I was that age, and nobody else at that age I knew at the time did either, as far as I know - in exchange for possibly reducing the risk that they themselves would be slaughtered.