Source of pessimism? For example: https://en.wikipedia.org/wiki/List_of_nuclear_close_calls https://en.wikipedia.org/wiki/List_of_nuclear_close_calls Assign a

Source of pessimism? For example: https://en.wikipedia.org/wiki/List_of_nuclear_close_calls https://en.wikipedia.org/wiki/List_of_nuclear_close_calls Assign a non-zero probability that it'll actually go wrong, then extrapolate 10.000 years into the future. The odds aren't necessarily in our favour. And that's just one of many risks out there, over the course of a blink of an eye in the history of the universe/galaxy/earth/humanity.