I believe that our very nature seeks to avoid being wrong and when we are indeed proven wrong and have no "out", our nature takes the next step and looks for a scapegoat; something, someone or somewhere that we can drop blame so as to avoid being accountable for our misdeeds. Let's look at this...
A child molester is placed on trial for numerous acts of sexual molestation. His defense? A genetic imbalance prohibited him from understanding the wrong in sodomizing young children; a defense he vigorously maintained until the prosecution discovers videotapes made by the defendant while committing these despicable acts. An immediate recess was pleaded to by the defense and a change of pleas was not far behind. Far-fetched? Not hardly. This is a true story.
Obviously, those videos completely changed the course of that trial, but why? Here's why...there is no explanation, there is no rationalizing, there is no genetic imbalance that could excuse the actions of this man. It was not a genetic imbalance and when all the cards were laid out and no other scapegoats remained, the only other explanation to offer was the one that the defendant knew all along..."I was wrong and should not have done what I did. How can I avoid as much punishment for my wrongdoing as possible?"
The alcoholic, the child molestor, the rapist...in my opinion, none of these people were "born that way". Somewhere in their lives, they zigged when they should have zagged and as a result, they are the way they are. What better way to avoid personal accountability that to blame wrongdoing on something so totally out of our control as genetic makeup?