No, he is saying that outside influences have no bearing on the morality of the choices, and thus little to no bearing on the type of response from society's justice systems.  Having a mental dysfunction is already a consideration in the modern concept of justice and morality, it's just not an excuse.  If you ate lead paint as a child, and then go out a do crazy things as an adult, is that cause and effect?  Clearly it is not, considering the large number of people who were also exposed to lead as children who did not grow up to be clockwork orange characters.  And the excuse about the kind of family one is born into is just as faulty, for all of the upstanding and generally successful people who came from broken, criminal and dysfunctional family influences.

No matter what kind of devil made you do it, you are still responsible for the consequences of your actions.  That is the very definition of adulthood.