Let’s go with the atomic bomb…if you disagree, consider that we made a weapon too powerful to ever be used again, but nations that have them get taken way more seriously in diplomacy.

And let’s be serious, it’s pretty much tick-tock, tick-tock before they get used again when they get put in the hands of zealots. Let’s be doubly serious, it will be religion that convinces some leader that they are within their divine rights to cleanse the world of their enemies.