Spelljammer made more sense.
Scientology believes that 65 million years ago, the evil galactic overlord Xenu dealt with the overpopulation problem of the Galactic Confederation by calling in countless billions of people for psychiatric examinations and tax audits, and having a conspiracy of evil psychiatrists sedate everyone who showed up (why they hate psychiatrists, they believe this evil conspiracy continues to this day), then packed them onto huge fleets of spaceplanes (that look just like DC-3's with rocket engines), and flew them to the planet Teegeeack (which we now know as Earth), then stacked them up around volcanos and killed them by dropping nuclear bombs into those volcanos to set them off (know all those old "dianetics" ads with volcanos exploding, it's a reference to this). However, Xenu didn't want people to reincarnate in the rest of his galaxy, so he set up a huge network of forcefields and holographic projectors to capture the fleeing "thetans" (i.e. souls) and show them holographic images of lies to believe in like other religions, and to give them a subliminal command that if they ever found out the truth about what happened to them they would die of a wasting disease. Then the "thetans" all were stranded on Earth, confused and kept reincarnating there, and all mental illness is due to confused past life memories and evil propaganda implanted by Xenu, and that after their powerful "auditing" techniques to remove these confused memories, you lose all mental illnesses, fears, and problems and gain superhuman powers and become a supergenius (note that Tom Cruise credits Scientology with curing his dyslexia). They claim that anybody who hears the whole story of Xenu will die because of the "R6 Implant" that Xenu initated 65 million years ago, and only Scientology has the whole information to safely teach somebody the whole truth.
You don't get that information until you normally reach a very high level in their organization called "Operating Thetan III", which normally takes years and hundreds of thousands of dollars or signing an enlistment contract for 1 billion years (no joke) with their paramilitary arm, the Sea Organization and working for them for the rest of your life. Look up the words "fishman affadavit" online for all the info.
Personally, I've seen psychiatric medication and treatment do worlds of good for people who seriously needed it, and I had a good friend who had to deal with the CoS (her husband became a scientologist, and saw what it did to him). Antidepressants and anti-ADD medications are probably overprecribed because some psychiatrists see it as easier to medicate a problem than deal with the root cause, but the drugs and treatments themselves have a lot of inherent value, even if a few practitioners take the "quick and easy path" of just prescribing some medication when counseling and therapy might be more effective.