The total number of warheads worldwide in the 80's was around 70,000. We're currently sitting around 12,000, with most of these in the US and Russia. So please realize that those of us who were kids in the 80's, and who watched movies like The Day After while growing up, had at least as much existential dread to deal with in elementary school back then.
Remember to put everything in perspective. There's never been a time in human history without widespread misery, and by pretty much any metric you'd much rather be alive right now than at any other time. No, it's not anywhere near perfect, and yes, there's a ton of stuff to keep working on, and yes, we do backslide sometimes, like now. But ignoring the big picture is dangerous, because it means we're at risk of repeating mistakes of the past.
For instance, it was fashionable a few years ago, particularly amongst the political left, to be against free speech. Famously it was the royal guy (prince Harry?) who said the right to freedom of speech was "bonkers". While you don't hear it so much anymore, you have to question why such a fundamental ideal of democracy was brought into question, when it had clearly been put in place for good reasons, and appears to be an important foundation of democratic principles since then. We now have a leader of the US who clearly thinks it's OK to ignore the first amendment (the whole FCC going after ABC and Kimmel) and we also have an extremist from the left who shot a guy on campus because he didn't like what he was *saying*.
Yet these existential threats, whether it's nuclear war or constitutional threats, or even the environment, have been happening constantly. It's nothing new. We fight and argue, and there's bluster and violence, but in the end we always seem to end up with better quality of life, decreasing poverty, and longer lifespans.
Now is not the time to bemoan the fact that the world is not up to your level of perfection. Now is the time to pick some particular problem that you can make better, and get to work, as did the people who came before us. Be part of the solution. Yes, nuclear weapons are scary, but nuclear power is also the solution to fossil fuels. And no, it's not a perfect solution. But it's the solution we've got. This is the real world. I'm sorry you don't like it. Nobody here has a magic wand.