You mean it has prevented a hot war between the US and Russia, instead we had lots of substitute wars were mostly only brown people died (sarcasm!). Essentially

You mean it has prevented a hot war between the US and Russia, instead we had lots of substitute wars were mostly only brown people died (sarcasm!). Essentially nuclear weapons meant that all nuclear powers could act with impunity toward non-nuclear powers who were not directly aligned with any of the blocks. I mean Ukraine is like a prime exhibition, Putin would have likely never invaded if he didn't have nuclear weapons, and the west would have likely reacted much earlier. The arguments are definitely not as straight-forward.