The best argument I heard for not having a gun in school came from a gun owning teacher - He worried less that a single shooter would enter the school and begin a spree, than he was a slighted student getting hold of the gun and shooting a bully. It's not just having a gun, it's being able to use it effectively and protect it. Of the 60 or so teachers I know, I would trust one: marksman, multi-black belt kung fu and art teacher - and today his arthritis pretty much negates the kung fu knowledge.
I used to think it was terrible that life was unfair. Then I thought what if life were fair and all of the terrible things that happen came because we really deserved them? Now I take comfort in the general unfairness and hostility of the universe.