I believe that the USA citizenry is becoming more narcisistic and less compassionate over time.
We see very public examples of this in our political and religious media. Even our prayers have become narcissistic and focused upon wealth over people (consider the "name it and claim it" church phenomenon, prosperity preaching, etc).
As we struggle with tremendous income inequality and concentration of wealth and power in the hands of but a few, millions of Americans fall into the trap of emulating that behavior often demonstrated by those "at the top". Unfortunately, some of the worst civil behaviors are concentrated in that small group.
How Wealth Reduces Compassion - Scientific American
In part, Donald Trump has cashed in on this phenomenon. He verbalizes the angry and xenophobic things that have been bubbling under the surface for so many during the OBama presidency. Those people then believe that Trump will work for THEM (since he speaks like them), even though nothing in his life would suggest philanthropy, altruism, or generosity are anywhere near priority in his life choices.