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Originally Posted by Nodrog
The fact that X is an indirect cause of people doing Y doesnt mean that they should have any interest in X.
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Arguably though, psychological traits which lead to
wanting to propogate your genes (if genetically influenced themselves) could have been selected over time, but that's dubious. In either sense, people's motivation to have children is unlikely to be known to them.
I'm not really sure what people mean by "should" though (in this context). You should respect your parents seems an ethical statement (or command), "Individuals should want to propogate their genes" seems to be more of about prediction.