I grant you Biden is pretty cynical. But in what I say above, I'm thinking of people who think explicitly about their morals, that is, sets of rules which they got from somewhere. Now, if you look back in American history a few years, something like 95% of Americans supported the War in Vietnam at its (public) outset; they supported the invasion of Iraq; most White Americans opposed the Civil Rights movement, and Martin Luther King was the most hated man in America. If you asked them now about these things, almost all of them would say they were on the anti-war, anti-racism side, and they name superhighways through the slums for the Reverend King, since he is safely dead. It's pretty easy to twist things around. Morals seem to usually be something people use to prove other people are bad, and to signal their virtue.