From page 66 of volume 3 of his masterpiece trilogy, Law, Legislation, and Liberty:
“But the near-universal acceptance of a belief does not prove that it is valid or even meaningful any more than the general belief in witches or ghosts proved the validity of these concepts. What we have to deal with in the case of ‘social justice’ is simply a quasi-religious superstition of the kind which we should respectfully leave in peace so long as it merely makes those happy who hold it, but which we must fight when it becomes the pretext of coercing other men. And the prevailing belief in ‘social justice’ is at present probably the gravest threat to most other values of a free civilization.
…there can be no doubt that moral and religious beliefs can destroy a civilization and that, where such doctrines prevail, not only the most cherished beliefs but also the most revered moral leaders, sometimes saintly figures whose unselfishness is beyond question, may become grave dangers to the values which the same people regard as unshakeable. Against this threat we can protect ourselves only by subjecting even our dearest dreams of a better world to ruthless rational dissection.”