Why can Americans be a nice person?

I mean Americans always look down on people from different countries. In reality, America is not a great place anyway. Random shooting, racism, poverty and unemployment are daily news in the states. Isnt that ironic that Americans feel superior?
Update: Media? dude... I used to live in America for 5 years. And I'm not a bigot from middle east. My English is fine, in fact, better than most of American I worked with.
Update 2: every country has problems. America got more problems.....
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