Yhyjyk

Several times has happened that the definition of mental disorders/ psychological-psychiatrist therapies/theories have been proven wrong. Yet they have been applied over people causing them problems and harm in their lives. Usually graduated psychologists/ psychiatrists are ignorant which is the supposed proof of these theories. They've been told they have been proven sometimes, sometimes they've been given some details, and they don't know they don't have a real basis behind them until it's massively accepted they are wrong. Personally, I see little to no responsibilities in them. In the other hand, governments and states promote these theories in secondary schools, they teach them and form professionals in national universities, and they hold the power to treat people in trials and to internate someone for being ill under these theories. Some other organizations, which I'm not very aware who they are, but I assume they might be colleges or agrupations of psychiatrists/psychologists regulate their professional's activities, and I assume they might be the ones giving the content to national universities for the formation of professionals under these theories. When one of these theories/therapies are proven wrong and have caused harm over people, who is the legal responsibility?

I assume there aren't many cases like this, but I make the parallelism with biological sciences. If an association or group produces a medicament which is proven harmful for people later, and that association teaches doctors to give this medicament to people, with the approval and fundings/places of national government created universities, it would be pretty much the same. Then, in the case stated in the topic question, who would be legally responsible for the application of these mainstream wrong psychological/psychiatrist therapies?

Your question is almost too general to answer, but the basic answer is; being wrong is not a crime. Negligence is, but applying generally accepted medical diagnoses and treatments is not negligent. Malpractice is also a crime (or at least reason to suspend a medical licence); but evolving a theory based on experimental evidence, submitting it to peer review and having it generally accepted, and then later seeing it superseded by another theory is not malpractice, it is the normal scientific method.

And no definition has ever been "proven wrong" since a definition, like an axiom, is neither verifiable nor falsifiable. The definitions of disorders vary betweeen countries, and most certainly change over time, but that is not because of any discovery or proof.