Correct, and the MODs have the right to ban him if he is guilty of trolling. And if you don't know what trolling is, look it up...google is your friend. With freedom of speech comes responsibility.
They didn't ban him or delete the post so your comment is irrelevant. Are you suggesting that his post was not responsible? He seemed to be expressing genuinely held views.
Thanks for your explanation of trolling but as a very early Internet adopter with 24 years on Usenet newsgroups and latterly web forums, I think I know what a troll is.