There is great difference in clinical practice and educational foundation between "psychologists" and "psychiatrists." Just to make that point here.
However, I have encountered some truly nutty among both fields, and I reserve those adjectives ("truly nutty") for the most egregiously disturbed.
A psychiatrist in CA (medical degree and license) who had been institutionalized for paranoid schizophrenia but had managed to keep that quiet inorder to maintain his license. It wasn't so much the license that was the disturbance but that the guy WAS, in fact, a paranoid schizophrenic who was making determinations about other vulnerable persons.
As to psychologists, I've heard worse.
I agree that it appears to be a case of the most disturbed among us humans who seeks out the field of, especially, psychology (a social science). Psychiatry, at least, requires a more profound education and clinical expertise.