Black swans happen. Which is why I’ve modified the slogan, hope for the best, prepare for the worst to: Hope and work for the best (and also be prepared to wrestle with the worst if it arises).
This reminds me of a piece from the.
Hope, on the contrary, is not the belief that “things will get better” but the belief that “things can get better.” To be hopeful is not to be certain that things will improve, it is to refuse to accept that this is as good as it can get. If optimism says “this is the best of all possible worlds,” and pessimism retorts, “you’re right” – it is hope that responds to both by saying “a better world is possible.”