I don't think our end will be nuclear war. Call me a hopeless optimist, but I think we'll go out with a whimper - not a bang.
There are some crazy people on this planet. And some of those people have a lot of power. But not all the power. And those that are close to having all the power don't want to lose it.
People like Kim Jong Un know that if they push that button, everything they have ever known will be erased. Along with their legacy. And Jong Un's generals know that, too. Besides, they're probably too scared their own missile will fall short and kill them. I would be.
China ... pffft. We're their cash cow.
Putin isn't a dumbass. And I think [hope] some people in Iran still remember being the most progressive middle-eastern country ever. Pakistan ... is kind of crazy, but not
that crazy IMHO. Same goes for India.
There is one group that I think might be crazy enough to do it.