The radio hasn't always been a friend of mine. For a long time they didn't allow songs like "bullet to the head" or "imagine" out of fear that people will start thinking differently. Anyway I think censorship is advertisement paid for by the government. And once again it all comes down to ... MONEY!
Here's a really good opinion on what/how radio works. Kinda
down with radio. wont mention any specifics 'cus I'd get decapitated.