I would argue you're just not zooming out far enough. Those things were definitely a society-wide collapse, and horrible for the people who lived through them, but humanity as a whole has just continued to grow, develop, and thrive, at least from my perspective.

Let me put it this way: is there a time anywhere in the past 300,000 years where you'd prefer to jump back to if you were going to be born as a random person anywhere on earth?

In spite of everything we face today, I struggle to think I'd want to be born anytime in the past.