Robert Samuelson has an excellent article,
The Poisonous Politics of Self-Esteem
Unlike economic benefits, psychic benefits can be dispensed without going through Congress. Mere talk does the trick. Shrillness and venom are the coin of the realm. The opposition cannot simply be mistaken. It must be evil, selfish, racist, unpatriotic, immoral or just stupid. A culture of self-righteousness reigns across the political spectrum. Stridency from one feeds the other. Political polarization deepens; compromise becomes harder. How can anyone negotiate if the other side is so extreme?
Go read every word.