They visited, but flew away disappointed that they found no intelligent life.
Obviously they limited their visit to just the U.S. Capitol. There is intelligent life in America ... you just often need to look hard to find it.
With all else going on in American society, particularly with the destruction of American civil society, this UFO stuff is clearly a distraction ... a Congressional "Plan 9 from Outer Space" ... and just as worthy of serious consideration by intelligent, wise people as is the B-movie.