Believe it or not there are many legitimate critiques of psychiatry that have nothing to do with Scientology. Scientologists just give the rest of us a bad name while simultaneously giving people a way to engage in knee-jerk dismissal of criticism they don't want to hear. The people with the most legitimate critiques tend to ve neither Scientologists nor "dissident psychiatrists" (the latter of which just want to change the content of the system while leaving the power structure relatively intact), but rather consumer/survivor/ex-patient groups with direct experience of the worst parts of the system. There are problems with the power structures and implementation as well as the theory and "science" (much of which are like a bizarre game of Telephone started by people with weird biases that mostly go unquestioned -- as a friend put it, science for people who don't want to be bothered with real science).
This doesn't mean the whole thing is useless, but there are serious problems that aren't being addressed and in jangly cases are outright dismissed nThe dismissal usually takes the form of accusing people of being Scientologists or of grossly stereotyping the content of the criticism. This does a disservice to people who experience the far bottom end of the psychiatric power structures. What happens to us is systemic, not isolated cases of abuse. It's much harder to implement psychiatry well than badly. IMHO it should be replaced by some combination of neurology, cognitive neuroscience, assistance for people in crisis, and a bunch of other things that don't exist yet. To get a real idea of what we are dealing with I recommend the books On Our Own (Judi Chamberlin), Call Me Crazy (Irit Shimrat) and Beyond Bedlam (Jeanine Grobe).
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams