I'm pretty sure that I never mentioned shooting anyone (let alone school kids).
You have just proved my point, that you can justify carrying a weapon.
I don't need to. You can't legislate against lunatics. Someone who wants to kill and doesn't care about the consequences will always find a way. Even here in NZ, where we had our first plane hijacking last week.
Still no reason to carry a weapon in my opinion. Shit happens, live with it.