The judgement of fitness is subjective.
The fact that there is a fittest human is objective.
An individual is either fit or they are not. They either survive long enough to reproduce or they do not. There is nothing subjective about it and there isn't really a gradient to it.
Society is that part of our environment that we create over time and manipulate in order to improve everyone's odds of being fit. The fact that there are members of society who are wealthier than others might show that they have already benefited from what society provides. The mechanism requires that they put back into it and perhaps the real drain on society comes from those that refuse to do so.
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