The psychoanalyst Alice Miller has died. She was not an MD. I blame her popular writings - all on the one theme of the evil of parents - for fueling the "victimization" and "trauma" crazes in pop psychology of the late 20th Century.
You can term people who take one idea to explain everything as monomaniacs but, to try to be charitable to the recently dead, I would term it hopelessly if not crazily reductionistic.
In the human soul, easy answers and simple explanations of things never do any good. Her sorts of explanations got their traction by absolving people of their own decisions and choices by blaming others, thus further denigrating the powers and potentials of the human soul.