A Theory that changed my view of nearly all of human interaction.

In evolutionary biology there are two dominate strategies of reproduction.  One is best for situations where there are functionally unlimited resources, the other is best for species who live in an area where they have limited resources.  Infogalactic on r/K Selection Theory while the field of biology has more complicated ways to describe things today, this is a very informative framework to view Liberal vs. Conservative politics.  Anonymous Conservative's book "The  Evolutionary Psychology Behind Politics" unites what is known about evolutionary biology, politics, physical differences between liberals and conservatives into a coherent, predictive theory. 

Psychology of the r strategy.

• ▼ competition with peers
• ▼ competitive environment
• ▲ Promiscuity
• low investment single parenting
• early sexual behavior among offspring
• discards in-group loyalty as crazy

Psychology of K strategy

• ▲competition with peers
• ▲competitive environment
• Monogamy
• High investment two parenting
• delay sexual activity till max fitness.
• values high in-group loyalty for group competitions.

This masterfully done video by Matthew Drake & Tara McCarthy is well worth the watch, and for further reading I recommend that you get the book or read Anonymous conservatives' blog.