Why do people think that being means that it would be bred out if it has a genetic component?

The only people who are opposed to the idea that uality has a genetic component are those who want to judge s for their ual orientation and they cannot do that, if they have to concede that uality has a genetic component. So, they just deny that it is there. And, they don't even bother to do any research on the matter, either. So, their opinions can just be ignored.