What's the downside? If the info was irrelevant then I'd understand it, but obviously genes are relevant to risk. Just as there's nothing wrong with e.g. age-based discrimination, I don't see the problem here.
Sure there is, are you familiar with the Age Discrimination in Emloyment Act of 1967 [1]?
https://en.m.wikipedia.org/wiki/Age_Discrimination_in_Employ...