From Tibor Machan:

Re: Just bad boys, or malfunctioning brains? (Sept. 26): The title suggests either/or but both could be right. Being a bad boy could have its corollary brain state. By cultivating bad behavioral habits one could well shape one's brain in certain ways without the brain being the cause of the emerging bad character. This is a kind of chicken and egg question and the big point at issue is whether developing young people have a capacity for self development which they could fail to exercise, thus ending up out of (self) control. The sweeping implications of denying self-control should suggest that it is not sensible to take it as the norm for anyone. Or, in other words, use it or lose it.