I'm taking courses in pol sci and one of the things I'm learning is how to write to politicians so I have a basuc udea of what the letters should look like. I can be pretty civil if I have to. Instead of saying "Dear Sinator Jean Fraud Commie..." I can zddress him by his proper title, even though he doesn't deserve it. ;)
You're correct .. they probably don't "deserve it" - but your letters have much more power if you obey the rules.
Even though some of them have NO RESPECT FOR US - they do expect you to have respect for them.