While I support measures to increase mental health access, the majority of these shootings would happen regardless of that - and would happen even if we had tougher gun laws. Most of these shootings happen when a guy gets his parents' legally purchased guns and goes on a shooting spree. How do you prevent that from happening? You can decrease school shootings by putting metal detectors and locked doors in schools, but good luck convincing white suburban parents to vote on that; having seen school and community boards here reject that because Little Johnny might feel like a criminal, I doubt it'll catch on. Say what you will about Detroit, nobody gets shot inside schools.