So, "mental retardation" is a an evolution of wild types. Since wild types for human personality are NPA types, mental retardation is an evolutionary adaptation with shifts for each type that you described observing in Testie's answers.
Mental retardation is a relative term then though pejorative. It really just is one way to look at the some evolutionary trends in the human population. This explains the trend in "so-called" political correctness language and public policy is to promote equality in so far as humans can move in that direction politically.
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