The prohibition against selling organs isn't limited to the United States. Every country in the world prohibits selling body parts. If they allowed the practice, the murder rate would be incomprehensible. .
Horse hockey. Murders to harvest organs happen now BECAUSE there is a black market. With legitimate businesses competing to provide the service, there would be less illegal selling of body parts, not more.
As it is, with all the laws and limitations in place, there is still a black market for human organs.
Which would all but go away with a legitimate market, just as the black market for booze did following the repeal of alcohol prohibition.
I am not a donor. I would not be a donor. I have no religious reasons. It's a general creep factor and that my body is the only property I am permitted to own (so far) I intend to keep every inch of it to the grave.
Your choice. A fucked up, cruel and needlessly hurtful choice, but it's still your choice. That wouldn't change with a free market for transplants.
But suppose, hypothetically you were allowed to pre-sell your organs. Then something happens in your lifetime that renders those organs useless. You get an incurable STD for instance. Is that not a breach of contract?
No, not a "breach of contract" but merely a contractual occurrence that would likely render the contract null and void. So what? Such things can be easily handled contractually.
I suspect most people would enter into such a contract so that in the event of their untimely death, their organs would be harvested and their beneficiaries paid. Good for the family that just lost a member. If a company were to offer payment now in exchange for organs following death, it would up to them to deal with the contractual arrangement. Either way, it would be a contract between two parties. Not your business.
Organs that are too old are not viable transplant organs.
Everyone knows that. The market wouldn't pay for such organs, would they?
Suppose the one who made money pre selling their organs just lives too long?
That's the problem of the company, if they were to offer a pre-payment. Again, not your concern.
Should there be a cut off date beyond which you could not take your body parts? Sell your liver and you won't live past 60
Your body, your choice. Besides, a free market wouldn't be trying to get people to sell body parts before they die, but after. Again, none of this should be your business and certainly not the governments.