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All of the doors at any school are reinforced with multiple heavy duty hinges, wire reinforced glass and thick doors but not for reasons of security. Fire regulations dictate that doors and windows need to hold up for a period of time at a certain temperature. I can guarantee that I could go down to the local school to find very formidable doors and wire reinforced windows not easily broken through.
As for a single piece of kevlar or other similar fabric placed into a backpack no one knows how it will truly perform. A laboratory would have to test the combination and come to a conclusion. What if the shot lands at the edge? Just placing some type of armor in a pack doesnt guarantee it will work or work well.
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