It's true that cryonics is about death, but I don't think that necessarily means there's "a lot of emotion involved". Most forms of rejection to cryonics that I've seen seem to be pretty intellectual, actually; there's a bunch of things like cost-benefit analysis and probability estimates going on, etc. I personally think it's likely that there is some motivated cognition going on, but I don't think it's due to heavy emotions. As I said in my earlier comment, I think that the main factor against cryonics is the fact that it seems "weird", and therefore the people who are signed up for it also seem "weird". If that's the case, then it may be to the advantage of cryonics advocates to place themselves in the "normal" category first by acting skeptical of a crankish-sounding idea, before slowly getting "convinced". Compare that approach to the usual approach: "Hey, death sucks, wanna sign up to get your head frozen so you'll have a chance at getting thawed in the future?" Comparatively speaking, I think that the "usual" approach is significantly more likely to get you landed in the "crackpot" category.