Does your school have a debate club or a newspaper or some other place where students can express their side of the story?
If not, go outside the school and write a letter to the editor of your local newspaper. Don't mention the principal's name, but describe respectfully what happened and why you think he's wrong. You can request to have your name withheld (but people will respect you and your perspective more if you don't). It might open up a productive dialogue for the whole community.
|