This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand fit that description, people accept it as some sort of natural fact, without further thought. They forget that morality deals only with issues open to man’s choice (i.e., to his free will) — and, therefore, that no statistical generalizations are valid in this matter.

If man is “gray” by nature, no moral concepts are applicable to him, including “grayness,”
and no such thing as morality is possible. But if man has free will, then the fact that ten (or ten million) men made the wrong choice, does not necessitate that the eleventh one will make it; ...
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