I doubt Ashton and Mila apologized because they actually regret writing those letters; this is just damage control because they got caught defending a rapist. Also, Scientology isn't a religion, it's a criminal organization, and it ought to be treated as such.
I was disappointed to hear that Kurtwood Smith wrote a letter in support of Masterson too. I really liked him in RoboCop... but I guess there's a reason why he was so good at acting like a total bastard.