Confused thinking

See:

http://www.physorg.com/news/2011-03-natural-relatives-selfish-altruistic.html

Article reads: The Reading study, based on population genetics, suggests that the numbers of altruistic and selfish individuals in society are controlled by a law of diminishing returns. If there are only one or two altruists in a family, and their actions help others in the family sufficiently compared to the cost of the altrusistic behavior, then genes for altruism will do better than genes for selfishness, resulting in more altruists in the family tree. So eventually all individuals in the population may be altruistic. Alternatively, when there are many altruists natural selection may ensure that altruistic genes are less likely to be passed on.

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