Here's how you get rid of a teacher: make their life miserable. My IT teacher quit his job, and here's how the school board bastards got rid of him:
He was teaching his Security class, showing us how to use BackTrack, Wireshark, Nmap etc... He has been teaching this class for years. His superiors recently decided that they don't want him around anymore, so they started complaining to the school board that he is teaching students "hacking" and they will all become criminals, etc. They would make up new lies about him every week. They even threatened to call the police so he would stop teaching kids "how to commit crimes". So he decided one day that he's had enough and would quit. Interestingly, once he submitted his resignation letter all his problems went away. All the treats stopped. The school would pay his salary until the end of the school year and then he would leave. So for the rest of the semester we would just waste time and played video games in class instead of learning, because he couldn't teach the class anymore.
So there went one of my favorite teachers. Most of the teachers in my high school were incompetent fools who have never deserved their jobs, but they all stayed. None of them were fired. I feel like I was denied an education.