"It was morality that burned the books of the ancient sages, and morality that halted the free inquiry of the Golden Age and substituted for it the credulous imbecility of the Age of Faith. It was a fixed moral code and a fixed theology which robbed the human race of a thousand years by wasting them upon alchemy, heretic-burning, witchcraft and sacerdotalism." -- H.L. Mencken

Morality is the wrong word to use. It is also highly subjective. Whose morality is this guy even talking about? What does it mean to increase morality? Mencken again:

"Immorality is the morality of those who are having a better time. You will never convince the average farmer's mare that the late Maud S. was not dreadfully immoral."

Morality is the right word, though; this is not ethics. It is unethical no matter what for psychologists to date their patients. It is not unethical for you to date one of their patients. Maybe a given psychologist is definitely not abusing their power/role in their relationship with a patient, and is sure that they are still an effective psychologist for their patient/lover. Then it may be morally OK (depending on your moral code), but it is still unethical.