i just believe that travolta acknowledged his son's condition, but he didn't choose to seek the usual treatment regiments under some kind of influence or advice.
wether that was religious advice, medical advice, or legal advice, or a pseudo-belief in all three, they just have to take responsibility for that.
i.e. he's not stupid, or ignorant, he's just badly misinformed.
i have my own view of the cult of scientology, you'd have to be a fan of dualism to fully appreciate that hating yourself is a big part of the process of 'adjusting', and it's a powerful thing to tune into.
especially the deflection of self identity into 'you' and 'thetan-you', rather than the id/ego supposition, which proposes the opposite view, that we are naturally chaotic and unstable, and the brain supresses that instinct, the thetan, then becomes the devil, a foreign entity, an object rather than a person. it.
scientology ties well into the mythology of perfection, i.e. the idea of perfection/normality being the original state, and that you can be disinfected/cleaned/cured/adjusted/absolved/fixed/saved. in that respect, it's a lot like fundamentalist christian movements and a lot of other religious beliefs, the potential for salvation means you can perform any action without consequence or comprehension, because the reward is so desirable, becoming perfect, normal, etc. and because you're damaged, you can't respond rationally, 'we' have to do your thinking for you.
you can see why psychology would be a threat to an institution like that. or, even to the institution of psychology itself. but, given at the time, electroshock therapy, frontal lobotomies without anaesthesia and trepanning were common treatments, it probably was saner for L Ron Hubbard to advise people to shun treatment. 50 years on, it's a bit tougher to take that view.
and, from all accounts, its quite possible L Ron Hubbard was an aspie. maybe. see if it fits, i guess.