You're right that the logical structure of consequentialist arguments are not inherently bad. The argument you mention is the class of argument that I find relevant, and many other people too.
But my point is that this is why we can expect endless rationalization in this form.
It is very easy to turn your argument upside down: "Allowing the state, rather than the private individual, to decide about the time and manner of the individual's death sends the wrong kind of cultural message around and makes those people who don't think logically but rather associatively more likely to violate people in other ways and other areas of life against their will, as they will not see the destruction of the informed consent principle in itself as bad, but only the mere end of a life whose span was limited anyway."
You can make the same framing for making people suffer against their will, and even murdering people if you frame it in terms of "ownership of life" (the government decides who has to live and who has to die).
The religious people who honestly say, "It's a sin", can be countered with, "That is your right to believe, but freedom of religion says you can't ban something for everyone just because you think it's a sin. If you want freedom of religion for yourself, you have to accept it for others, which means you have to try to convince people instead of coercing them."
That is the cultural foundation for a peaceful existence in a pluralistic society.
Ah... I see. You are applying to the sense of libertarianism that is very strong in American culture, the idea that it is thinkable, possible and even normal for the people to allow or not allow something for the state. To me it is a very alien concept, I am used to it being the other way around, the state decided if we are allowed something or not. I mean it was very clearly the case in the time of absolute monarchy, so up to roughly 1920, and basically just democratizing it did not change it. Just because now kings are elected for 4 years, there are chec...
Scott Adams, the author of the Dilbert comic and several books, my favorite being How to Fail at Almost Everything and Still Win Big, named his debating format The Rationality Engine. He calls it this way because he claims that it is "the system for turning irrational opinions into rational outcomes". He applies it to several polarizing issues, those this site tends to label "Politics" and "Mind Killer" and shy away from.
His first application, investigating the gender pay gap, seems to have worked pretty well, resulting in several unexpected conclusions. His second, Who is More Anti-Science? I found to be slightly less impressive, but still producing a rather balanced output.
Now he is applying it to the debate about Assisted Dying. Scott's goal is to have a law passed in California that is similar to the ones already in effect in Oregon and several other places.
Scott will debate Jimmy Akin, a prominent contributor to Catholic Answers.
I am quite attracted to Scott's attempts at hands-on instrumental rationality, and on a rather grand scale to boot. They are very much in the spirit of his latest book.
Currently he is accepting suggestions for questions and links for all sides of the issue. Feel free to contribute.
EDIT: I think adding cryonics to the discussion would only complicate the issue and not be helpful, but that's just a guess.