Agreed. Also helpful is if the parts of you with close access to e.g. your posture and voice tone have an unshakable belief in your dominance within the tribe, and your irresistible sex appeal. In fact social interaction in general is the best example of somewhere that dark side rationality is helpful.

This is the best article on lesswrong in some time. I think it should at least be considered for entry into the sequences. it raises some extremely important challenges to the general ethos around here.