@kurt9 
"I don't remember there being any protests during the recession in the early 90's. Can anyone tell me what was special about the early 00's recession that would spark protests?" 
 
The difference was, in the early 90's the leftist groups were recovering from the fall of the USSR. They were looking for something to protest against to keep their status.

Maybe, the "altruistic punishment" trait apperar to be more ereditable because it is more useful than the "altruistic" and the "risk taking" traits. 
The usefulness is linked to the ability of a population rich of altruistic punishers to grow more cooperative by controlling the number of freeriders, where a population too rich of altruistic people will have more problems to control freeriders. 
So, for the population is better to have high ereditable "altruistic punishment" traits than "altruistic" traits or "risk taking" traits.