One thing people go through as they age is an elevation of cynicism and general misanthropy. After decades of being disappointed when naive idealism and speculative optimism fail, one can just get down on it all. It is really hard not to succumb to this. It requires active effort and sometimes even a willful ignorance. "turn a blind eye" is the idiom here. Monty Python's "Always look on the bright side of life" kind…
I think that's why historical education is so important (or just liking history as in my case), looked through the lens of history all of the current shit as bad as it is, is really nothing all that new either, the only constant is change after all. As the aphorism goes: History may not repeat but it sure does rhyme.
History shows that things can and do improve when people try. The overall trajectory has been positive, even if bumpy.