Ah, I see. So to say "I'm not defending claim X" sounds more like "I disagree with X" than "I feel confused about X". I don't know how universal that is.
If you already think he believes something for a reason you believe is wrong, you're not putting much faith in his rationality.
Really? You seem to be radically overestimating human rationality in general. We all likely believe things for reasons that are too weak to justify our levels of belief, or believe things due to cultural upbringing and other reasons which have zero actual evidentiary weight. Part of the task of becoming more rational is identifying those issues and dealing with them, especially the higher priority things that impact a lot of other beliefs. Everyone here, including myself, likely believes things for bad reasons. In that context, discussing where beliefs come from seems natural.
I think that wedrifid is one of the more careful, rational and thought provoking people here. That doesn't mean that he's a perfect rationalist.
Check out the latest episode of Castle (Headcase) to see Cryonics covered in mainstream fiction in a not entirely terrible manner. The details are not exactly accurate but probably not more inaccurate than similar fictionalised coverage of most other industries. In fact there is one obvious implementation difference that the company in Castle uses which is how things clearly ought to be:
Amulets of Immortality
It is not uncommon for cryonics enthusiasts to make 'immortality' jokes about their ALCOR necklaces but the equivalent on the show make the obvious practical next step. The patients have heart rate monitors with GPS signalers that signal the cryonics company as soon as the patient flatlines. This is just obviously the way things should be and it is regrettable that the market is not yet broad enough for 'obvious' to have been translated into common practice.
Other things to watch out for: