The main point of the whole thing is not that Americans would be idiots, but rather that the way the United States is being governed is very suboptimal to the wellbeing of the average citizen and average inhabitant of this planet (yes, the way Americans live, how much they consume, has a great impact on every single human being on this planet).

Many points made are very clear, and well supported (e.g. income equality: http://www.ted.com/talks/richard_wilkinson.html).

As it happens, I have similar political views with author of the infographic, and I admire Northern European countries. But that doesn't mean that I have something to criticise about the USA. My home country is way behind in terms of government transparency, and liberal, free-thought of its population.