Not at all. Maybe an over reaction depending on the situation. But there are lots of schools that do not allow cameras. The one I work at does not forbid it but any photograph taken of students must be used for educational purposes, and every parent signs permission for heir child to be photographed for educational purposes and identification purposes only.
It is a wacky world we live and if Marko is going to be taking pictures at school he needs to be within building policy. If he was off school grounds in a public place he could shoot all he wanted too.