During the seminarian shortages of the 60's and 70's, the queers were recruited and proliferated under the mistaken notion that their sexual orientation (which in and of itself is NOT a sin) would not be acted upon, since celibacy was required. "No 'sex,' no sin." Of course, I suspect that the fellows who pushed this notion were probably gay themselves!
Some homosexuals, BTW, have always been drawn to the clergy. There have been homosexual popes, bishops, abbots, etc, throughout the ages.
This is exactly the formulation arrived at in the 1960s, and it is gravely in error. Even if every self-identified homosexual priest and bishop were continent (celibacy is remaining in the unmarried state, a promise they have no problem with) - even IF every self-identified homosexual priest and bishop never had sex with another man or boy in their entire life - by accepting the modern category of "homosexual person" they deny the natural law. They are unable to relate in a pastoral way to men, to women, to boys and to girls. Even as they remain pro forma celibate (unmarried), they make no sacrifice thereby, since they do not desire marriage to a woman to begin with. Their sacrificial priesthood is therefore meaningless.
Because their desires are "objectively disordered" per CCC 2358, it is impossible for them to function as pastors.
So, the idea that a intrinsically disordered (CCC 2357) sexuality can serve nonetheless as a foundation for priesthood, never mind the episcopate, is mistaken in the first instance.