The Principal is a GOVT employee. An agent of the GOVT, if you will.
That employee/agent is using his GOVT position to deny rights.
Rights of the teacher to speak, and rights of the public to know. The GOVT may not silence you.
Ford on the other hand is NOT GOVT, and is not much different than my home. Start speaking things I do not like in my home, I can and will silence you.
See the difference?
Great post.