Hire a private detective. Have everyone who complained followed. If they do anything shady. Call their boss and have them fired.
Ummmm ... I'm not sure what inalienable right we are defending here?
The right to do a dumb thing?
The right to not be accountable?
As I posted before:
Your "personal e-mail list" should be limited to your "personal friends".
His was not.
His "personal e-mail list", included "parents from Grassland Middle School, where he coached football."
If you send your political opinions to your personal friends on your "personal e-mail list": No problem.
If you send your political opinions to a list of your employer's clients that you copied and pasted into the list of your personal friends on your "personal e-mail list": Big problem.
His defense should be as follows:
"I intended to send a partisan political joke to my personal friends and forgot that that I had copied and pasted a group of the parents of my students on a "personal list" that should have been strictly personal.
I am sorry and I apologize. Such a mishap will not happen again.
I will ensure that, in the future, "personal mail lists" and "working mailing lists" will remain separate on my computer."