This is a gratuitous argument. If he ever actually sees gravitation, for example, then he is one up on both Newton and Eistein. What Williams seems to be doing here is accusing psycho- logists of being scientists, i.e., they compare notes, question, experiment, and argue. Differences of opinion, however, do persist in how to treat various mental conditions. When I was majoring in psychology one message came through loud and clear.
Psychology has all the questions, but no answers.
In fact, psychology has a number of answers. If you add psychiatry you have even more answers. That is why it changes concepts every 6 hours. Yesterday Freud was in with his Penis envy and castration complexes. A few years ago it was Maslows heirchary of needs.