These models represent collections of individual people described by computer algorithms that capture a specific set of traits, such as a tendency to cooperate or not.

• You can give them new personalities to see how they would behave.
• You can observe social processes i...

Our intuitions are not fixed at birth. We develop social rules of thumb for interpersonal behavior based on the interactions we have. 

Change those interactions, and you change behavior.

Most of the psychological theories are verbal, but words can be imprecise. If "cooperation is intuitive", it needs to state when. And what does "intuitive" mean?

In order to solve this, computer simulations of society were developed.

Psychologists do not understand human moral behavior, because it seldom makes any logical sense.

Using moral philosophy and psychology, biology, economics, mathematics, and computer science, scientists are trying to study how morality operates in the real world.

There seems to be evolutionary logic to the human ability to cooperate but adjust if necessary. To trust, but verify. 

We generally collaborate with other people because it benefits us. Our rational minds let us work out when we might occasionally gain by acting selfishly instead.