That is a very good point about the newspapers. We really don't know what the story behind the story is. But all we have to go on is what the mass media present, and form our public opinion from it. That's kinda scary when you stop to think about it.
It seems the proper response might have been to call the teacher into the Principal's office and tell him to tone it down a bit because some of the parents were getting upset.
However, newspapers never give you all the facts and they all seem to put their own slant on everything, so maybe the math was an excuse to get rid of a teacher who causes a lot of on-going problems.