I don't have time to read the entire thread. Am I the only one that thinks that a dead person ought have no claim to organs? Is it worse to treat a body against the wishes of a dead person-- or even the living relatives-- or to let someone die?
No you're not, that's exactly what I was thinking. Once you're dead, your body is no longer you. Are some people really so spiteful that they're willing to let people die just because saving them would involve a piece of meat that used to be part of them?
And none of those factors are currently based on how good a person you are considered to be based on arbitrary criteria, chosen to potentially exact some petty revenge on those people you don't consider worthy of saving.
What priority should you be given for health care based on your "goodness"?
It's a nice strawman and slippery slope fallacy, but has nothing to do with the question at hand. The point has nothing to do with arbitrary criteria, "goodness", revenge or any of that crap. It simply says "If you agree to give X, you are more likely to recieve X if you need it.". That is in no way comparable to "If you do/say/believe/are/have Y, you are more likely to recieve X if you need it.". There is no slippery slope. A preference criterion based on the thing you are giving preference to is not related to criteria based on something else entirely. There are plenty of reasons I disagree with such a preference, being unfair to people who can't donate for example, but there is no need to try to make that argument via logical fallacies.
Overall, I think the donation system has two major flaws that nothing discussed in this thread would address. Firstly, families having the final say renders any system, opt-in or opt-out, irrelevant. Some people, especially various religious fanatics, will refuse to allow either donation or receipt of organs, regardless of the wishes of the person in question. I am sure there are other people who will do the exact opposite. As long as your choice is irrelevant as soon as it actually matters, it really doesn't matter what choice you have in the first place.
Secondly, there simply isn't enough clarity on the matter. Merely encouraging people to donate is not going to help if they don't know how to opt in (or out), and may not even know if they have or not. For example, I have no idea if I'm a registered donor or not. I've never signed up specifically and don't have a card, but I ticked the box when signing up for a driving license, and I think I remember ticking one somewhere else as well. Changing the system, adding incentives and so on won't make any difference if people still don't know what's going on.