Where I grew up, every high school had 2-4 cops stationed at it, every junior high had 2 cops, and they had big ass guns, including pistol grip shot guns. That was around 20 years ago. Guns in schools is not a new thing. And giving guns to a principle to sit under his desk is no big deal.
On a slight derail there really is no reason to send your kids to public school anymore, if your a semi responsible parent that is. The rise of charter schools, private schools, and vouchers. It's going to be like segregation except not on racial lines. Kids with parents who care will drive their kids to a safe, good school, that have armed security. The "poor" welfare kids will be getting bussed to a public school, while the parents procreate and buy crack with their EBT cards, not necessarily in that order. Reminds me of a bible verse, "For to everyone who has, more shall be given, and he will have an abundance; but from the one who does not have, even what he does have shall be taken away".