Looks like a decent precaution if you can afford it, I was just surprised it's on the Christian school's website. I guess praying isn't enough?
Who would have thought that praying wouldn't be enough? Lol. Seriously though, I've shot a lot of guns at a lot of things over the years and I don't know of any bullet short of a BMG .50 caliber that would penetrate a typical text book.
Seems like a reasonable precaution when you live in a gun mad society, or you could just bring in sane gun laws instead.
I don't see that ever happening with gun lobby controlled lawmakers.