O and his administration insiders have no feelings for or knowledge of what it means to be an American. They believe that America is an oppressor nation. The only history stressed to them in their entirely inadequate education is about the times our government treated groups poorly. Having this anti-American heritage person as president is so sad.
This is the basic problem--he is ignorant of, and uninterested in, American culture and history. To him, being "an American" is a mere technicality, like being a citizen of a third world hellhole with which he is more familiar. It means nothing to him. That's why he began his inaugural address with "My fellow citizens..." instead of "My fellow Americans..."