I largely agree with this sentiment, although I might say "we're (more) evil now." I find some strange comfort in knowing that this country wasn't designed to be a democracy, but rather a way for a propertied minority to somewhat democratically decide what should happen to everyone else. There have certainly been some improvements- Reconstruction, the Suffrage and Civil Rights Movements- but these movements are always damaged by the pendulum-swing-recking-ball which tries to revert the country back into its original, brutal shape.
It is interesting to note that the Nazis explicitly based their "Jewish Blood Laws" on American racial blood laws. Germany very much admired and wanted to emulate the U.S as an internationally-recognized superpower with a legally defined underclass and a history of ethic cleansing that "didn't hold it back." I'd say American involvement with Germany in WWII had less to do with the abhorrence of fascism, and more with its alliance with Britian and France, as well as Japan's alliance with Germany.