1) Depends on whether you draw an ethical distinction between causing to happen and letting happen. Since I am strongly against death penalty, I would have to defend the cryopreservation of terrible people if it were established that not freezing = actively killing.
2) North Korean law says that Grandpa Kim is the eternal ruler of the country. That corpse is beyond recovery now, but they may want to keep the current Kim in store if they want to follow the spirit of the law.
North Korean law
North Korea doesn't have a functioning rule of law. Treating it that way produces bad intuitions about how North Korea works.
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.)