Earlier quoted context omitted.
Gigantic? http://www.nytimes.com/2014/02/24/us/politics/pentagon-plans... Have you considered the gigantic military requirements that are placed on the United States? By treaty alone, the US is required to defend almost all of Europe, Japan, and South Korea. These are not easy requirements to disentangle from; if Japan alone were allowed and required to rearm, it could lead to an arms race that would destabilize all…
I'm not sure why the parent was modded down. It's 'settled theory' in the foreign policy world, though what philwelch lists are significant risks and not certainties. Also, I would add our obiligation to ensure the flow of energy from the Middle East. There are many benefits to being a hegemon, but it comes with obligations too.
A serious investment in nuclear would render those obligations moot.