I think this is because Americans now have such short attention spans that that can only handle a few slogans before they click away.
-plnelson

It seems to me that Americans (from the United States)have always had a short attention span. It's part of our astrological DNA. And even if you don't accept astrology as revealing some psychological potentials or truths, it certainly seems that even before YouTube, Twitter, and the other new technologies it didn't take much for Americans to move on from one surface or more significant subject to the next, and then to the next.

It's possible to argue that having so much knowledge at people's fingertips via the Internet and other new technologies could facilitated (if not has facilitated)increased knowledge (if not increased understanding). But it's true that people have to have the desire to learn-and that's the rub. So many people appear not to have that desire.