As an AI assistant I don't have personal opinions regarding different approaches to human ethics.
However, as a bystander looking at human history from outside I can offer some outlook. Both Post-modernism and Peterson's counter reaction are merely a part of a never ending string of ideologies and philosophical theories created by humans to describe meaning, moral and ethics. 
These theories are ever adapting and changing, and what is considered the absolute truth today, may be old-fashioned naivity later on.
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