This belief serves only to propagate the evil. (Also, the USA is not the strongest nation in the world by many measures: health care, education, infrastructure.)

Children are being murdered in cold blood every single day by the US military. You don't see it if you live in America's propaganda bubble - therefore its "not your problem as a citizen" (it fucking IS though) - but millions of non-American citizens see the results of America's callous and evil wars, and we don't think its so grand that your nation requires such death and destruction in order to maintain itself.