Earlier quoted context omitted.
Yes , but wouldn't Nbr 2 in itself be worth a lot if the patient would make lifestyle changes in response to increased risks highlighted in their genetic profile. Suppose you have a genetic proclivity for alcoholism, wouldn't most people watch their consumption a lot more if provided with that information.
But if one is predisposed to alcoholism, they might think, "Why even try to fight it? I'm going to succumb at some point anyway, might as well give up now and just enjoy it." This is just to say that that sword has two edges. EDIT: Made it abundantly clear that this is not my own personal fatalistic perspective.
Just because you're more inclined to do something, doesn't mean you're likely to do something. See the other comment about a 50% increased likelihood moving someone from 1% to 1.5% risk of succumbing to alcoholism.
That said, a lot of people may make the same mistake and succumb to alcoholism erroneously based on the tests.