The 'Average' American

In my experience, the general consensus amongst people I have encountered and the countries I have visited, the 'Americans are fat and not that intelligent'.
They should realize that life is not just all about burgers and fries and wake up to all the atrocities caused by their government around the world. It was obviously a plan to get their mitts on the billions of dollars worth of natural resources (any doubts about Afghanistan's natural resources were quashed by the sudden 'discovery' of huge reserves a few days ago; plus add opium into that equation).
If the US is so keen on world peace and wiping out rogue leaderships/ states, what did they do about Robert Mugabe? Or what are they doing about the rise of extremism in countries such as The Netherlands (anti Islamic extremism). Or why are they supporting Israel's illegal activities and endorsing what I call 'legal terrorism'?
So, is the 'average American' stupid? In a world of need and greed, supporting an organisation (the US government) that will just keep catering for the obese persons' only desire of burgers, fries and soda, might also actually be the work of a smart, but ignorant population.