Surely it's like genetic predisposition to anything else? Intelligence, depression, optimism? Some people are born with more chips in one area, one in another. It doesn't mean you say, 'well the odds are against me in this area so I won't try.' That's like saying, 'I'm never going to be a rocket scientist so I may as well drop out of school.' I don't get the excuse mentality at all. I may be predispositioned to crave sugar, having Semitic blood and a high instance of diabetes in the family - but if I put sweets in my mouth, it's still a choice...