We are still at risk of nuclear destruction. Not only are the old weapons still around but we are making new ones for some crazy reason. (Check the Doomsday Clock, I'm not the only person who has noticed that atomic war is still threatening this planet.)
You have to take the long view: For approximately a million years we lived in very stable societies (as judged by the artifacts and art left behind.) In fact the people of Sentinel Island and some other places still live this way.
Very recently, since roughly 10k to 15k ago, we started doing agriculture and cities. Since then things have been rough: wars, famines, societies collapsing, etc.
Despite that, in the last 400-500 years, we have developed science and technology, which has increased and accelerated civilization but not stabilized it.
Now of course some people have had it pretty good for, say, the last century or so (I date it from the ready availability of hot and cold running water in the tub. If you can take a hot bath you're ahead of the game, IMO.)
And that's great! And more and more people are getting in on that, which is also great!
But if you want to say, as you did, that "Pretty much every single generation other than your parents (assuming you’re 25-40) had a tougher time and lived in a world with a more uncertain future. Every generation, going back millions of years." that's wrong. It's only going back a few thousands of years, at most, and then only for a small fraction of the people on Earth.
That's before the problem that luxury the few are enjoying is bought at the cost of the life or our whole planet! Is it really so great after all if some people get to live well for a generation or two but then everybody (that survives) has to live in post-apocalyptic hell?
Sentinel Island will be destroyed by the rising ocean in a few decades or so. The folks that have lived there for some 40,000 years will die or be forced to migrate. That's on us, not them.