Miles isn't asking you to be a psychiatrist. He's asking you to respect: a) the evidence available to all active readers of newspapers and general nonfiction in the year 2004, and b) the experiences of the millions of people who've benefitted from talk therapy and/or SSRIs.
Activism and Marxism are not sufficient cures for neurosis, psychosis, and addiction. Individuals suffer, and pills and therapists help relieve this suffering. Stone cold fact.