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It's a false equation. I believe that it was DSM III that removed homosexuality as a "disorder" or form of mental illness, but I may be wrong. Imho, this was a serious mistake, and opened the door to the chaos that we have today.
It was removed due to pressure from homosexual militants. IIRC they came to a meeting of some professional psychiatric association - forced their way in, and demanded it be removed. Shouting, and all that stuff. It was nothing more than political revolt and demands. One of the head dudes whose name I can’t remember (and don’t have my files handy unfortunately) who was at first on board with the removal, now has reversed his stance.