...because by most objective measures, the country is far better off (dow, unemployment, gas prices, crime, growth, deficit, etc).
Maybe it's because they read every day how they are being cheated, how their taxes are being wasted, how the government is corrupt, how the country is overrun by thugs and terrorists. They read that because FB ranks posts according to "engagement" not "truth." So their feed, rather than getting more truthful over time, gets more outrageous.
I am not saying FB intends this to happen, but they are far from blameless. It's bad.
And why call people idiots? You don't think this is a problem? You don't see increasing division?