I don;t disrespect your point of view. But, one is a coach doing it, not to students but to his friends. The other is coercing students to comply. They’re really quite different, wouldn’t you say?
IF .... IF .... it had been only "to his friends", then it would have been perfectly O.K.
But, that's the rub. It was NOT solely "to his friends".
Your "friends" do not complain and ask that you be fired.
Where he messed up is that he included a list of parents in his "personal friends" list. He mixed "clients" with "personal friends".
As I posted above: "The cause is that he sent partisan political e-mail to a list of people, that were not his personal friends, but were, in effect, the clients of his employer.
You can send your personal friends whatever you please.
Once you get a list of your employer's clients and start sending them partisan political e-mails, dirty jokes, etc., your employer will not be happy and you may very well be fired."