While there will always be both evil and cowardice on this earth, that doesn't mean we sit idly by and watch. There are still things we can do about it to keep our family safe, and I think bulletproof  backpack inserts (nitpickers, you know what I mean. "Bullet-resistant.") may be something to consider. I tested the Streetwise 3A Backpack Insert from The Home Security Superstore, and here is what I found.

What does Level IIIA stop?

The short answer? Most handgun rounds. The long answer would read .22, .38 Special, .380, 9mm, .40 S&W, .357 Magnum, and .44 Magnum. It's my understanding that IIIA soft armor will protect against shotgun rounds as well, but the manufacturer doesn't state this, and there's a world of difference between a slug and birdshot.