I think that future morality would be different enough from current morality by the time it becomes possible to reawaken/resurrect/[please tell me what the LW term of choice is] cryonics patients such that cryonics patients in general would be regarded as less likely to be moral than people born in the future. Any future capable of bringing back cryonics patients would be highly likely to prevent crime in the cryonic population, and not let the Kim dynasty harm any future victims.
The main consequentialist reason to punish crimes is to prevent future crimes. Refusing to cryopreserve people who do bad things would be a poor deterrent, as most people display little interest in cryonics. Cryopreserving people who do bad things would be unlikely to increase the harm they could do, because the future could presumably refuse to bring back any patients who they saw as a threat until they knew how to mitigate that risk.
This month's media thread includes a short article on some people's idea to have Ayn Rand frozen, which ultimately didn't happen. My first reaction was a shudder. I thought, I definitely wouldn't want Ayn Rand preserved forever. My second thought was, What right do I have to say who can and who can't get frozen?
Whatever your thoughts on Ayn Rand, I think this can spark an interesting conversation: What, if anything, should humankind do about people who are widely seen as harmful for the whole? For example, if the Castro dynasty in Cuba or the Kim dynasty in North Korea decide to freeze themselves to ensure they will continue oppressing their countries forever, should that be prevented? (And yes, my opinion of Ayn Rand is such that these examples came to mind.)