Hate crimes are exactly what he is aiming for, or at least making it a real possibility in people's minds that random teachers might commit hate crimes in the name of religion. This is just another attack on public schools. It's meant to weaken people's trust in teachers just that much more. And it is not aimed at just Muslims either. I suspect that most everyone who read this immediately began to worry that this might really happen given the current state of the world. But now you are admitting to yourself that there are plenty of religious nutters out there and teaching positions. And of course you have to realize that a lot of teachers are not Christian. What in the world might be non-christians do in retaliation? Especially when you take into account that insert non-Christian belief here is so much more violent than Christians?
These people want to kill public schools, force everyone into private, for profit, secular schools. Places where they can teach whatever the fuck they want by claiming that it is part of their religion.
It's just one amongst thousands of other attacks on public schools, each meant to chip away and erode our faith in public systems.