Sorry, but I really don't get the problem of this case.
You are serious
Simply said even if that sound quite evident for me
School isn't a place to show murder video... Would you find it normal if the teacher would have shown
Animal Farm (not the Orwell book of course) or
Sucking Daddy or
Child Love or
Pre-Teen Sex because the students would have vote to see those films?
Anyway the guy was fired today, rightly so and his union won't defend him... Good riddance
edit : Just want to add and everybody here know that I'm against the "Won't somebody please think of the children!?!" mentallity. But there a big difference between what they can do in their home and what they can do in a house of education...