He who lives by the genetic excuse dies by the genetic excuse. Taking this line of reasoning to its rather inevitable end, then there is no reason to wait until a person with genetic predispositions to a) commit crimes; b) drive badly; c) gets lower grades and worse testing scores (Hah, remember that issue Saletan?). We should all have our genomes mapped or whatever it is they do, and for those folks: a) cage or kill the criminal types; b) deny driving licenses to the bad driving types; and c) stop wasting precious education resources on congenital doofi.

This is the same tripe that people like Clarence Darrow used (with equally crude proto- and pseudo- science) to get gold plated shitbags like Leopold and Loeb out of the noose. Though to be fair, I don't think Darrow cared whether they were compelled-- capital punishment is barbaric against even the most evil assholes so any excuse a judge or jury will latch on to to eschew state sponsored murder is fine with Darrow and fine with me.

But there's a big difference between fucked up brain chemistry which prevents free choice (i;e. compels behaviour despite efforts to not so behave) or confuses a person as to either "right and wrong" or the true nature of the world around them (i.e. my baby is Satan) and people who are somehow tagged as genetically predisposed to be more violent. Just because I'm genetically predisposed to want to fuck about three quarters of the women I encounter between the ages of 18 and 81 doesn't mean I get a pass when I try. It just means I have an issue. We all have issues and we are expected to deal with them in a way that does not distress society or those around us.

I mean, did we learn in grade school to "keep our hands to ourselves" unless we were genetically predisposed to "disturb others"? Hells no. Keep your hands to yourself, junior, or, over time, you will be beaten down and/or caged. A good system overall and any efforts to justify or mitigate such behavior based on genetics, especially when the understanding is yet so rudimentary, will simply end up justifying "thought crime" and other pre-emptive incarceration or punishment.

And look what doctrines of pre-emption have done to us thus far.