Because the only thing that limits nukes is food.
There is also the possibility, maybe likelihood that the US tracked the Swedes all the way in their approach to the carrier and just never let on that they were discovered. Let our enemies invest in technology that we already can defeat.
True..... not all force must be projected across the world.
Some of our sub fleet would be close to home. and we could produce a large number of these at a much-reduced cost with very little loss in effectiveness...
Nah. You just troll some lines out the torpedo tubes.