From what I understand, things will get bad but for 99% of the world, the rest of this century should be bearable climate-wise. There simply aren't enough fossil fuels in the ground to keep it burning longer than 2100~ish anyways. I mean, the problem is very real and millions might die, but at the same time the majority of the billions will do ok as well, so no real cause for nihilsm on that front. Especially considering the mortality rates at the same decades a century earlier would still be significantly higher.
Wars, economic crises and other turmoils however, that's a tough one. Even climate change alone will stress out too many things and exasperate those areas.
It's more like we've had it really good post-WW2 over all, and that will go away pretty soon. Even ocean currents collapsing and acidification of the ocean, as bad as it is, it won't yet be the worst or cataclysmic I'm afraid.
Widespread undesirable situations like that tend to result in humans coming up with solutions too. It took us WW2 to get nuclear energy. It took slavery and colonialism to get us the industrial age. Bad things and good things tend to come and go alike.
Add on atomic bombs and biosphere collapse and I’m not just worried for the USA but civilization itself not making it many more decades