The bulk of the risk wouldn't really scale with number of warheads though would it? I was thinking it is more of a binary. There is some number of warheads that

The bulk of the risk wouldn't really scale with number of warheads though would it? I was thinking it is more of a binary. There is some number of warheads that is enough. The experience in the Cuban Missile crisis suggests that the number deployed on submarines is probably more of a concern when it comes to miscalculation than the total. And for deliberate attacks the militaries have probably calculated that the number currently deployed is reasonable to wipe out a major power.