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I'm worried that if we start making excuses for people based on their genes that people will be able to get away with anything. Obviously if someone has a propensity for heart disease, it might be good to guide them toward healthy eating and excersize, but what if they have a propensity for violence? Can we get to a point where murderers can say "Look at this structure in my brain! It's smaller than yours so I'm not responsible for my actions"? How does a wife whose husband has been unfaithful respond with the knowledge that "his genes made him more likely to do it?" 

I don't know, I'm fuzzy on the issue, because knowing that someone has a higher liklihood of depression might get them help sooner... but knowing someone has a propensity to cheat just makes me feel like we've given them an excuse to do so.