Well, since race issues has come up...

Different groups of people are naturally predisposed to different ailments. Now that the genetic testing is prove it, it could be used as a weapon to 'weed out' certain ethnic groups, for 'the good of the whole'. The types of laws that this would create wouldn't even have to name those groups, just the ailments they're naturally more inclined to have, and it would have the same effect. This sort of back-handed ethnic cleansing is exactly what scares me about the whole idea, because it would be way too easy for someone who believes in white superiority (or any other, for that matter) to sneak in laws targeted at a certain group of people without the rest of us realizing that's the goal.

And this has kind of been mentioned, but if we're talking about sterilizing people, it's inherently more dangerous to do so on a woman than on a man. Better methods are being developed, but the most common permanent sterilization methods require surgery, while for a man it's an outpatient procedure.