I mostly agree with you. I would even expand your point to say that if you want to convince anyone (who isn't a perfect Bayesian) to do anything, the probability of success will almost always be higher if you use primarily emotional manipulation rather than rational argument. But cryonics inspires such strong negative emotional reactions in people that I think it would be nearly impossible to combat those with emotional manipulation of the type you describe alone. I haven't heard of anyone choosing cryonics for themselves without having to make a rational effort to override their gut response against it, and that requires understanding the facts. Besides, I think the type of males who choose cryonics tend to have female partners of at least above-average intelligence, so that should make the explanatory process marginally less difficult.