Geez xpanda - I find myself agreeing with you about America being the cop! The problem is that the US is the superpower - and, as 911 proved, economies can be delicate things that can topple at the drop of a jet. The US can let the world go to hell in a handbasket, or it can intervene. I like my standard of living - so I prefer that the US government protect the US economy.
By the way - if I were a Canadian, I'd want the same thing, because if our economy shits the bed, then your economy will do the same - at best! I'm not trying to demean Canada when I say this, but our economies are so intertwined that, economically speaking, Canada is like a fifty first state.