Comment by lossolo

Exactly this. If you do not have the capability to produce as much conventional weaponry as your enemy (especially if that enemy also has a nuclear arsenal) then you've lost.

Sitting in the Whitehouse facing the red button, you ask yourself which city are we willing to trade by pushing that button? Millions in New York or Los Angeles? That's why they will never use nukes. To retain world hegemon status and protect your interests, you need conventional military strength. Because if your aircraft carriers are sunk and the vast majority of your fleet is disabled or destroyed, what will you do? Your shipbuilding capacity is so low that you've basically already lost, you can't project power overseas without a fleet and you can't reproduce it fast enough. What are you going to do then nuke them? They will retaliate, and every decision maker knows that. No one will choose to kill millions/tens of millions of their citizens because they lost a fleet thousands of kilometers from home.