Sure, they're absolutely allowed to have this protest if it's sanctioned by staff, which it was in most schools as far as I understand it. I just wonder how many of these kids weighed the constitutional arguments or gun homicide data and statistics before they marched out there. And these kids are sacred cows. You can't really argue your position on guns or gun policy when you have a bunch of kids out there. Suddenly your data or arguments don't matter, because you're arguing against the wishes of thousands of kids, and that makes you heartless, de facto.