OK, I think we're talking at cross purposes slightly here.
My issue isn't that the idea that certain personality traits, or intelligence levels, or predispositions to addictions have a basis in genetics. My issue is that there are people on this thread who think that having those genetics makes you a "worse" person. Makes you a subclass, or subhuman. That's the opinion that I'm finding abhorrent.
To use a personal example, I have a problem with alcohol. There may be a genetic component to this, my Dads relationship with it isn't great, and my Grandad was a full blown alcoholic.
But a far bigger reason for my issue with it is that I was born to very young parents who weren't really ready to give up their friends and social lives, so as a child I spent huge parts of my weekend down the rugby club, or the pub. As a result I learnt that I really liked the pub, it was full of people I knew and liked, it felt warm and safe and fun.
I grew up, started drinking and that warm and safe feeling transferred to the beer itself. I had a kid and stopped going to the pub, but drank at home instead. So, my child isn't going to have that feeling about the pub, but maybe I've normalised drinking too much at home for her instead.
Had my parents been avid hikers or film goers instead, would I still have an alcohol problem? Maybe, but it seems a lot less likely.
Or a more generic example, let's say two people are genetically predisposed to anger. One of them grows up in a household with domestic abuse, one doesn't. Which one is going to think it's normal or acceptable to hit his wife.
I'm not denying that genetics play a part in who you are, I'm just opposed to the viewpoint that certain people are doomed or should be classed as "other" because of those genetics.
Plenty of people are screwed over because of who their parents are, but it's not the genes they passed on that are the problem.