More that we've almost killed ourselves with nukes several times, its mostly coincidences and individual bravery that have prevented the end of the human race.

Yes, statistics, the study of history, reflection on logical fallacies and other pesky worldly knowledge would not work, we need to, instead, account for multiverses.

This isn't as wild as it sounds; he's referring to the Anthropic Principle, and it's a valid way to look at it. We are having this conversation in this context because civilization is still intact.

> I still think 80 years is a success story

This is a US centric view. You define success favorably to your argument. The world has not even been at peace since, with the sole nuclear weapon user being involved in a significant number of consequential wars after WWII. I guess you mean no conflict between great powers on a global scale, which I doubt anyone seriously considers stable and long lasting. But if there were total peace, 80 years wouldn't be such an outlier, given we've had long periods of peace before nuclear weapons as well. You might be right, or you might be wrong, but your reasoning isn't quite there yet.