Evanelpus - Correct, and a major reason why Conventional Trident was
canned in the US, despite Hoss Cartwright's enthusiasm for Conventional Prompt Global Strike (I think he liked it because it didn't involve any Air Force pilots).
And if the boats have conventional warheads, or no warheads at all, they create an incentive for an adversary to move quickly towards a desired end-state before they can be armed.