Semantics aside, I am not proposing choosing natural (say what evolution chose pre-humans) definitions. However, defining the specifics for what is considered

Semantics aside, I am not proposing choosing natural (say what evolution chose pre-humans) definitions. However, defining the specifics for what is considered as fit and unfit is indeed the key question. The point I am making is that this has not been done thoughtfully, most leaders and lawmakers do not have a good understanding of this (but they are in position of power anyways).