In my experience, you don't "have" to be polite and calm, but if you are, more people will listen. Savage (or Wiener, pronounced Whiner) is so over the top that I don't even buy into the thought that HE believes what he says. He's just figured a out a way to make a good living and be famous.
He's selling the sizzle, and his audience is buying.
I think his show is like whiskey, small doses are ok, too much causes brain damage.
In my opinion, a general lack of civility is one of the main reasons the country is going to hell.