Would you say in retrospect that you'd been a bad parent, or would you plead that, in retrospect, you made the best possible decision given the information that you had?

I reject your framing. I would say that I had made a bad mistake. Errors do not a bad parent make. Or, to put it another way, suppose you woke up in the Christian Hell; would you plead that you had made the best decision on the available information? Scary what-ifs are no argument. You cannot make me reconsider a probability assignment by pointing out the bad consequences if my assessment is wrong; you can only do so by adding information. I understand that you believe you're trying to save my life, but please be aware that turning to the Dark Side to do so is not likely to impress me; if you need the power of the Dark Side, how good can your argument be, anyway?

What probabilities do you assign?

The brain's functioning depends on electric and chemical potentials internal to the cells as well as connections between the cells. I believe that cryonics can maintain the network, but not the internal state of the nodes; consequently I assign "too low to meaningfully consider" to the probability of restoring my personality from my frozen brain. If the technology improves, I will reconsider.

Edit: I should specify that right now I have no children, lest I be misunderstood. It seems quite possible I will have some in the near future, though.