The results are so attractive (longer lives, pefect kids, etc) to many people that it has and will attract large amounts of research money. With financing like this, there will be some places on earth that will be friendly to the research even the R&D has to be done secret.
Because the products of this research will be illegal, the products will be available only to the very rich. The very rich will live longer and have offspring of the highest quality thus enabling them to gain more money and power. The end result of the illegalization will be to encrease the divide between the have's and the have nots.
People who demand morality based legislation have a blind eye for the lessons history.
And this argument is supposed to make me put my aversion to human destruction for the sake of vanity aside? I'd rather be a "have-not" and be true to my faith than a lemming following blindly so I can be "one of the advantaged crowd."