Unfortunately, "it would end life on Earth as we know it" is not, on its own terms, a thing that will stop it from happening. All it takes is the people who can make the decision deciding to do it because they think they will come out ahead, and not caring about what it may do to anyone else. And they don't even have to be right. They just have to think they will come out ahead.

Don't mistake talking about a thing as advocating for that thing. It leaves you completely unable to process international politics, and frankly, a lot of other news and discussion as well. If you can only think about things you approve of, your model of the world is worse than useless.