As is the case in every instance I can imagine, the proof of something's correctness or appropriateness, is to be judged by the results it brings about, either satisfactory or otherwise.

I believe (based upon scant knowledge I admit) that most therapy is useless or worse.

I have believed for a very long time that the best therapy is unlikely to come from the professionals. Instead, properly trained laypeople are the most viable solution to the therapy problem.