This is one of my favorite examples of observer effects.
It's impossible for us to observe a universe that doesn't allow us to exist, meaning that the universe we do observe (our universe) will necessarily have properties that allow us to exist, no matter how weird or unlikely those properties may be.
The same thing goes for nuclear proliferation. In order for us to observe a world in which humanity has had the ability to destroy itself in nuclear war for the better part of a century, we have to live in a world where not only has that capacity existed, it also hasn't been used. That means that every close call, no matter how weird, has to have played out that way because we are in a world where it didn't kill us all. Of course the world is weird as fuck: we're the end result of decades of narrowly avoided catastrophe.
The diplomacy, economics, and random fucking bullshit that led to this moment could, for all we know, have been impossible any other way. Maybe in the world where the pepsi cola company never has a navy, the soviet union gets twitchy in 1988 and the world ends. Maybe in the world where Jimmy Carter doesn't get into an altercation with a swimming rabbit, he's just a little too arrogant in a meeting and escalates when he should defuse. Maybe in a world where reagan isn't married to the og hollywood throat goat, he's slightly more stressed and hits the big red button one day because he heard they got black people in russia.
The world is weird, but it's the only world that can lead to this moment.