Anonymous Conservative uses some interesting research into the evolved behavioral dynamics of animal populations and applies it to human populations to explain the Left-Right political divide. The gist of the argument is that two distinct behavioral psychologies exist among animals, r and K:
The terms r and K came from variables in equations which described how populations would change over time. r represented the maximal reproductive rate of an individual, while K represented the carrying capacity of an environment.
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The first environment an organism may face is the presence of freely available resources, which is referred to as an r-selective environment.
In r-selection, those individuals who waste time fighting for food will be out-reproduced by pacifists, who simply focus upon eating, and reproducing. Fighting also entails risks of injury or death – risks which are pointless given the free availability of resources everywhere. Hence this environment will favor a tendency towards conflict avoidance, and tend to cull the aggressive and competitive. It will also evolve tendencies towards mating as early as possible, as often as possible, with as many mates as possible, while investing as little effort as possible rearing offspring. Here, there are unlimited resources just waiting to be utilized, and even the most unfit can acquire them. As a result, it is more advantageous to produce as many offspring as possible, as quickly as possible, regardless of fitness, so as to out-reproduce those who either waste time producing quality offspring or waste time competing with each other.
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In the other environment, a population exists at the carrying capacity of its environment. Since there is not enough food to go around, and someone must die from starvation, this will evolve a specific psychology within such a species. Termed a K-type psychology, or K-Selected Reproductive Strategy, this psychology will embrace competitions between individuals and accept disparities in competitive outcomes as an innate part of the world, that is not to be challenged. Since individuals who do not fight for some portion of the limited resources will starve, this environment will favor an innately competitive, conflict-prone psychology. Study shows, such a psychology will also tend to embrace monogamy, embrace chastity until monogamous adulthood, and favor high-investment, two-parent parenting, with an emphasis upon rearing as successful an offspring as possible.
This explains the very different social outlook of the pioneers from, say, the modern Progressives. To the pioneers, everything must be worked for, built, exploited, expanded and defended. They cleared the forests, planted the prairies, drilled and tapped the aquifers, mined the mountains, built power plants, built dams and irrigated the dry lands. Progressives see and teach that as a history of evil and greed, all while maximizing their use of it and working to destroy it by neglect or regulation.