I did say that in-group, authority and purity are necessary for the maintenance of order, but I would never give them a blanket endorsement.

Reciprocity is a deep instinct; it is the basic currency of social life.

While the political right may moralize sex, the political left is doing it with food. Food is becoming extremely moralized nowadays, and a lot of it is ideas about purity, about what you're willing to touch, or put into your body.

Morality binds and blinds.

The extreme self-sacrifice characteristic of group-selected species such as ants and bees can often be found among soldiers.

To understand most important ideas in psychology, you need to understand how the mind is divided into parts that sometimes conflict. We assume that there is one person in each body, but in some ways we are each more like a committee whose members have been thrown together to do a job, but who often find themselves working at cross purposes.

What set us apart from most or all of the other hominid species was our ultrasociality, our ability to be highly cooperative, even with strangers, people who are not at all related to us.