More fingers on more triggers means more chances for miscalculation, accidents, or a desperate regime actually using one. Math is brutal: probability scales with players.
More nuclear states means more fingers on triggers, more misreads, and more chances for weak command systems to fail. The odds of catastrophe go up.
Absolutely. More fingers on the nuclear button mathematically increases the odds of a miscalculation, accident, or rogue launch.
More nukes in more hands means way more chances for screw-ups, paranoia, or one rogue leader going off. History shows deterrence works until it suddenly doesn't with extra players.