helped develop it
Well, Rutherford split the atom - do we get royalties now?
I am personally glad that we could (probably) rely on the US if we were attacked. You could probably rely on us if you were attacked too. Unfortunately, there is a definition problem around "attacked".
We weren't shy in 6 of the last 7 wars (I, II, Korea, Vietnam, Iraq the first time and Afghanistan), and if the need was there I think we would again. In fact, I think we have the dubious honour in WWI of suffering the worst per capita death rate (amongst the Allies, in any case).
In any case, we do sorta work together - not supporting the Iraq war had trade repercussions (sp?) and that is ok. The no nukes deal is a sort of ingrained national psyche thing - although there is a 50% chance in our current election that the ruling party would reconsider the no nukes stance and (if they think it warranted) put it to a referendum, at which point it would be well and truely rejected.