You acting superior because you're from somewhere else is equivalent to an American acting superior because he's an American.
It's not about acting superior, it's about being able to see the system with clarity.
People who work within a system for their whole lives adapt themselves to it, and either find workarounds for aspects that restrict them or learn to conform to the restrictions. If they don't, they don't thrive or sometimes even survive. Someone coming from outside, from a culture with different (though sometimes overlapping restrictions) will feel those constraints more strongly, as they haven't adapted so closely to them.
So for an Australian (like me or Assange), or a Chinese (like Taco), the American socio-political constraints are clearer, and the flaws more glaring, not because we're better, but because we've grown up outside them.
TLDR: Sometimes it's easier to see things from the outside.