I'm very sympathetic to the man, and obviously there would be no serious action at all if a liberal teacher did something similar on his side of the political line.
However, teachers in public schools who want to get students thinking outside the liberal box need to be VERY CAREFUL. If they go about this frontally, without subtlety and "plausible deniability," they're screwed -- and so are the students who they won't get to teach.
Linking Evolution to the Nazi's in a biology class is far outside of any sane person's box.
It certainly shows the PC Tolerance that the loving Left wants to indoctrinate our kids with. As a teacher of some 45 years, I have mangaged to always skip the PC malarky and call a spade a spade. Of course, my colleagues though I was a nut but I am still doing my thing. And as a pastor, I teach and preach the Gospel not the tolerant PC wishy washy malarky that the Left wants the Church to teach. Odd that the Left which says it speaks for freedom is the one which is the totalitarian in nature! Ha.