Uh-oh, if 3/4 of people can't conversate, couldn't it just be that people aren't meant to do that?
Humans are a social animal, and if you're not convinced of that, study the psychological effects of feral children and solitary confinement.
One of my first exposures to real-life Americans was riding a bus in London with a bunch of American tourists who kept saying "Ooooooooohhh, look at all those _peeeeoplee!" as if they were shocked that one of the major streets in one of the world's largest cities should have a lot of people on it.