No, I read that. And this is what I saw:
I have had a lrabroad
of correspondence with professors over the years, and I have never once opened an email that began "Unless bla bla bla".
There is at least an opening sentence that is missing. I would wait to pass any judgement before I saw that, because it could easily contain something like "As promised, more on Natural Moral Theory from our discussion in class on Tuesday..."
That is how these types of emails typically begin. That no greeting or introduction, just a bold statement of supposedly 'personal' ideology opens the email...this strikes me as odd. It smells of sensationalism.
I can see connections between what he is saying, Natural Moral whatever, even where he might have gone with it. And it's entirely instructional.
We don't burn books to cater to crazies, so I don't see why we should turn to burning teachers.