Why is the U.S. allowed to have nuclear capabilities?

[Sin]

My thoughts on this are pretty ...skeptical.

First article I read on this was This One and frankly N.Korea's involvement is probably what worries the most. They've made their stance pretty clear by now on things like this.

As far as the US dictating who can or cannot have nukes, its a pretty simple (not to mention effective) war strategy. By ensuring that any non-allies can't get access to nuclear bombs, they keep themselves in the advantage. Its smart, to put it bluntly... not only in their own self interest, but in global interests as well.

Toss in the Russian's involvement (as limited as it may or may not be at this point, going by what that article says) and we can probably trace the roots of this "arising problem" back to the Cold War easily enough.