This objection to absolute moral values is based on the assumption that there is insufficient constancy in human nature to guarantee absolute validity to any particular virtue or value. Most subjectivists would argue that moral views are no more and no less than reflections of the psychological state of the speaker.
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Absolute definition and meaning | Collins English Dictionary
A final objection to absolutism can be made on the grounds that any moral view that becomes absolute cannot be viewed from a critical vantage point beyond itself. Put simply, an absolute moral view may breed injustice through ‘legalism’ or ‘moralism’. Legalism is as much a mind-fix as it is a type of ethic. Taking what is perceived to be an absolute rule, further rules are prescribed for every conceivable situation where the rule may apply. Legalistic moralists tend to be fundamentalists, and inflexible, imposing the letter of law sometimes without regard to its spirit.