Not all of us are, but the anger is understandable.
Would you be upset if the dominating belief system in your country was Scientology? Would you be angered that your laws were dictated by something that you can only see as completely ridiculous? Would you be upset for being ostracized because you refuse to get regular E-meter testing done? Would you get sick of the moderate scientologists saying that they’re ok, but the crazies give them a bad name? How much would you like to be called insensitive for expressing your belief that there is no such thing as Xenu?