First, no one under 21 would be able to get such a thing, and if some nut did, you'd think there would be enough sane students with CCW permits to take down a nut before they could do such devastation.
We've alowed the nation to become full of nuts, yes, it may take a while to weed them out and restore the nation back to a level of moral conduct that we have allowed to be exceeded.
But if we fail to act, then we will never see freedom like we once had in the 60's and 70's freedom that young people today have never known, and so dismiss as an old fogy tale. It was far more freedom than we have now.