It goes more than that. They've put in millions specifically into fighting psychiatry, made a front-group called Citizens Commission for Human Rights, dedicated to fighting psychiatry, made an anti-psychiatry museum, and a video calling psychiatry an "industry of death."
This isn't just "scorn" for western medicine. They've accused us with causing the Nazi movement, making Osama Bin Laden into a terrorist using psychiatric techniques, say we're responsible for 9-11, among pretty much every other whacky thing you can think of. (Oh no, they're onto me. In real life I'm Cobra Commander, Destro, I need a shipment of laser assault rifles now!)
http://teapotatheism.blogspot.com/2009/02/scientology-psychiatry-made-osama-bin.html
http://en.wikipedia.org/wiki/Psychiatry:_An_Industry_of_Death
http://www.youtube.com/watch?v=Am69VRizgX8
Why take it to such extreme I don't know, but the theories are that Hubbard had a hard-on against psychology and psychiatry because in his attempt to make some money, he made a psychotherapy center that had no science backing up his practice and was shut down based on recommendations by both APAs. That psychotherapy center became Scientology and he turned it into a religion because as such, you can't define what is to be acceptable or not and he had tax shelter.
Some of their criticisms of the field actually are legit but are on the same grounds as having problems with any bad doctor. There are bad psychiatrists out there just as there's bad surgeons, ob-gyn doctors, policemen, etc. That's the type of stuff where I actually think there should be criticism going on because in that regard it would make us a better field. Unfortunately they're not trying to be an advocacy or consumer watch-dog group. What they do is instead of trying to bring-down the bad doctors in the field, they use them and try to portray the entire field as bad by only reporting the actions of the bad ones.
Then there's the other stuff that is true but is from decades to even hundreds of years ago that they're still trying to rake us over the coals such as lobotomies that fell out of favor decades ago. The rest of the stuff is just pure BS like trying to say we masterminded 9-11 (Hey Hitler, only we know you're really still alive, I'll see you at the party next weekend. Don't forget the bean-dip and tell Eva I said hi).
I've mentioned this several times in other threads. There are things in this field (as any field) that need improvement, and some things that frankly I think 10 years from now will be seen with scorn such as we now see lobotomies are bad treatment decades ago. A difference is I state these to improve the situation. The Scientologists have a paranoid belief that we're some type of space aliens (not joking) bent on taking over the world for the purposes of evil and are locked into some type of self-declared war upon us to take us down because they believe we're Decepticons or something like that. Hey if that was the case, where the heck is my holodeck? I'd love to put on the Playboy Mansion program (I'm being semi-sarcastic, we're all adults, and yes my wife occasionally reads these forums).