(minor criticism of the myth of the rational voter)
People do vote rationally. Its rational to vote morally even at high personal cost.
I dont have time to refute the part Kaplan got wrong. But it should be obvious that he got it wrong.
The failure of economic thought is currently one of insufficient tribalism and insufficient nationalism.
Any group that votes immorally will be exterminated by groups that vote morally.
That is why the anglo world is dying: its immoral (reproductively destructive).