Negativity is a positive thingy

Maybe not classical Greek philosophy, but “no regrets” holds up as one of the top tattooed beliefs. “Think positive” or “be happy”--  we’re bombarded with messaging that constantly pushing us to make lemonade out of those lemons. Is a positive mindset and no regrets the key to organizational success? Should we be making all that lemonade? Is failure merely a result of a lack of optimism? And what does that look like when put up against climate change, pandemics and war?