It is my experience that people who tend to think in black and white, and who gravitate towards extreme personal belief systems, resemble one another to a large degree (in the way they debate their side of an issue; in the way they utilize language to exhaust the opposite side with repetitive assaults rather than defending their side and strengthening their argument; in the way they devolve into personal attacks) much more than they resemble the rest of their party, and much more than they resemble more moderate fellow college graduates. I talked about it briefly here: