I was totally with you up until this point. Modern humans have achieved amazing things, but have also invented whole new catagories of potential self inflicted catastrophies.
We are one nuclear war or environmental collapse away from being a complete failure of a culture, and taking thousands of other species down with us. The biggest modern advances have only just happened, in historical terms, and we've already had some very close calls, with more on the way.
Meanwhile, I suppose a super volcano or a shift to ice age temps would be disastrous for the environment and crop yields, but technology would be our only recourse for dealing with it and adapting to it.
I'll admit, there's trade-offs to modern tech. It's definitely a double-edged sword, and I'm not sure our physiological systems are well-tuned for modern society (i.e. hunting and gathering guaranteed an active lifestyle). But overall, I think it's a positive.
I get the feeling you aren't familiar with Vasily Arkhipov or Stanislav Petrov. Sorry, you will probably feel depressed/sick. I do when I consider these events, and a weird sense of unreality and insanity.
It wasn't government policy that prevented nuclear war, but people disobeying orders.
https://en.wikipedia.org/wiki/Vasily_Arkhipov_(vice_admiral)