Make your children better than theirs. Smarter? Less likely to get diseases? Who knows. The point is, now your side has the edge, so they have to keep up. Maybe they get the edge next, so you have to innovate. And so on. Assuming there's sufficient "headroom" to build up these genetic transhumans, and we don't run into some no-free-lunch scenario where improvement is either impossible or comes with unavoidable nasty side-effects, you can't just sit still. You have to continue to improve or you can no longer pretend that all people are created equal in certain important respects. Morally equal, yes, but "morally equal" doesn't get you a leadership position.