There's no more reason to take their organs when they die than there is to take their money and spend it on saving lives.
If people were routinely burning all their assets when they died, preventing anyone from getting any use out of them, I think I would be in favor of a policy that mandated the donation of the property for life-saving purposes. In the property case, one could at least make the argument that mandating redistribution after death would disincentivize people from working hard during their lifetimes. I don't see a similar disincentive associated with mandatory redistribution of organs after death.
I'm pretty convinced that mandatory organ donation upon brain-death is an unmitigated good thing. Are there any sound arguments against it, besides the pragmatic difficulty of selling the policy to people? So the important question for me is: Should we institute an organ market for living donors in addition to requiring donation upon death? There are costs to the organ market, as has been pointed out in the comments. Also, an organ sold by a living donor is one less organ harvested from a cadaver, so an organ market wouldn't increase the number of organs available for transplant in the long term. It would skew the allocation of available organs towards the wealthy, which raises equity concerns.
The big advantage to the organ market that I see is that it allows for better matching of donors and patients. My understanding is that harvested organs can't be stored for more than a few days, so if an organ is harvested from a cadaver it might go to waste because of the lack of suitable patients in the (spatial or temporal) vicinity of the donor. If there were an organ market, some organs which would otherwise be wasted in this way would in fact get transplanted. I guess my view on the organ market would hinge on the extent of to which it would mitigate this kind of waste, and that's an empirical question. If anyone knows of data pertinent to this question, I'd be interested in hearing about it.
I'm pretty convinced that mandatory organ donation upon brain-death is an unmitigated good thing.
Are you aware that it would mean no more cryonics?
(Even if you want to preserve the head only, the injection of anti-ice fluids makes the rest of body unusable for transplantation.)
Or is the convention against discussing politics here silly?
I propose a test. I'm going to try to lay down some rules on voting on comments for the test here (not that I can force anybody to abide by them):
1.) Top-level comments should introduce arguments (or ridicule me and/or this test); responses should be responses to those arguments.
2.) Upvote and downvote based on whether or not you find an argument convincing in the context in which it was raised. This means if it's a good argument against the argument it is responding to, not whether or not there's a good/obvious counterargument to it; if you have a good counterargument, raise it. If it's a convincing argument, and the counterargument is also convincing, upvote both. If both arguments are unconvincing, downvote both.
3.) Try not to downvote particular comments excessively, if they're legitimate lines of argument. A faulty line of argument provides opportunity for rebuttal, and so for our test has value even then; that is, I want some faulty lines of argument here. If you disagree, please downvote me, instead of the faulty comments, because this post is what you want less of, not those comments. This necessarily implies, for balance, that we not excessively upvote comments. I'd suggest fairly arbitrary limits of 3/-3?
Edit: 4.) A single argument per comment would be ideal; as MixedNuts points out here, it's otherwise hard to distinguish between one good and one bad argument, which makes the upvoting/downvoting difficult to evaluate. (My apologies about missing this, folks.)
I'm going to try really hard not to get personally involved, except to lay down a leading comment posing an argument against abortion, a position I don't hold, for the record. The core of the argument isn't disingenuous, and I hold that this argument is true, it just doesn't lead to my opposing abortion. I do not hold the moral axiom by which I extend the basic argument to argue against abortion, however; I'm playing the devil's advocate to try to help me from getting sucked into the argument while providing an initial point of discussion.
Which leads me to the next point: If you see a hole in an argument, even if it's an argument for a perspective you agree with, poke through it. The goal is to see whether we can have a constructive political argument here.
The fact that this is a test, and known to be a test, means this isn't a blind study. Uh, try to act as if you're not being tested?
After it's gone on a little while, if this post hasn't been hopelessly downvoted and ridiculed (and thus the premise and test discarded as undesirable to begin with), we can put up a poll to see whether people found the political debates helpful, not helpful, and so on.