It's certainly understandable that these precautions are being taken. During a field trip last year, I was driving a car full of kids when I received a call from the principal on my cell phone. Before the call faded, I thought I heard something like, "Please kill all the kids in the car ahead of you." Here's what happened.
Also, many fathers who pick up their kids at the school like to come in full Viking battle dress. There are frequent slaughters (followed by the inevitable pillaging) at our school.
Yep, I bet we're a lot like your school. It's no wonder we need this kind of protection. It's hard to believe that years ago there were no cell phones, no pagers, no text messaging, no fingerprinting, kids walked to school, kids rode their bikes around the neighborhood and car seats weren't designed to withstand direct hits from Exocet missiles.
It's amazing we ever survived.