From Feser’s latest post:
This is why Aquinas regards what he calls “blindness of mind,” “self-love,” and “hatred of God” as among the “daughters of lust” — where by “lust” Aquinas means, not sexual desire, but rather sexual indulgence that is in some way or other disordered. Sexual immorality fosters “blindness of mind” in the sense that the one indulging in it tends to have greater difficulty than he otherwise would in thinking coolly and dispassionately about matters of sex. He tends toward “self-love” in that he is strongly inclined to make his own subjective feelings and desires the measure by which to judge any proposed standards of morality, rather than letting objective moral standards be the measure by which to judge his feelings and desires. He tends toward “hatred of God” insofar as the very idea that there is an objective moral law or lawgiver who might condemn his indulgence becomes abhorrent to him. (I recently discussed Aquinas’s analysis at length here.)
So, when a sexually libertine liberal activist shrieks “Bigot! Bigot! Bigot!” in your face at the top of his lungs as if he were putting forward a rational argument, or tries to destroy a person’s reputation and strip him of his livelihood in the name of compassion, or threatens to kill him or burn down his business in the name of tolerance, the manifest cognitive dissonance should not be surprising. It is only to be expected. Sexual libertinism is destructive of rationality.