bmelton kinda nailed it, but no, of course it's fine/normal to believe your beliefs are right (note the lower case 'right'). It's when one becomes so dogmatic as to believe that the other side is made up of brainwashed morons that a problem arises.
Conservatives brainwashed liberals into brainwashing conservatives into liberals. It's a giant ironic conspiracy cooked up by Anh Rand and the U.S. Government. I read it in an article on Wikipedia.
