How come we never have a discussion about the 50's-90's where more guns where at schools than any other time in American history and less mass shootings. I don't think there has been a higher proximity of guns near school grounds than during these times. Guns have out numbered civilians for the last 70 years, and in the past children/teachers used to drive to school with a shotgun/deer rifle (or both) hanging visibly in the back window of their trucks. What changed in the last 20 years? The argument where people say that it's because they where shotguns or deer rifles has some ballistic education they need to undergo. I don't think many people understand just how much damage 3inch shells can do in a shotgun, or how much a 30-06/270/308 can penetrate through targets.