in the descent of man, darwin talks about survival of the group, not just the individual. so concepts like social darwinism don't grasp darwin's idea properly. darwin imagined that people can sacrifice themselves for the good of the group and still be in line with natural selection. besides, the term survival of the fittest doesn't really capture the concept of darwinism. it's not so much about weakness as much as it is about abilities to adapt to a changing environment long enough to procreate. so, talking about human communities, someone may be able to argue that charity can be a good thing, and also curing the sick and caring for the elderly? why? because all this can strengthen a community, and allow it to grow and adapt to new challenges.
and about evolutionary psychology.. attractiveness is one trait that is looked at.. but there are others, like being able to provide for a child and protect it.
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