The problem here is that the criteria you use to determine fitness may not be those that natural selection would choose. One of the major problems with most advocates of eugenics is that they really want to do all the selection themselves, but they can't and if they did they would almost certainly get it wrong, because they don't understand the full complexity of the system.
Cooperative social phenomena are also arguably things which have been selected for in terms of behavioural dispositions why should we ignore the benefits of these in favour of struggle?
TTFN,
WK
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