Even assuming just one possible past, I wouldn't care to cryonically preserve my 10 years younger self. It's possible that somewhere between that point in time and this present moment lies a sweet spot, but I can't really figure out where it is. Even if cryonics works, it's too likely to work so roughly that it doesn't really matter to present me who was vitrified in the first place.

With perfect altruism and infinite resources, I have a vision how this problem could go away completely. Too bad I was born with a brain heavily predisposed to egoism, and grew out of a relatively poor world.