It sounds like you are speaking only about active homosexuals in this axiom. I think you need to consider another side to this as well.
Admitting to the priesthood those inclined toward the homosexual disorder, even if they have not acted upon this inclination and do not intend to do so, is also a problem. Admitting them to the priesthood places such men in positions of extraordinary temptation, challenging their chastity and endangering their spiritual life. Due to the central role of a priest in the spiritual lives of others, should they find themselves unable to resist their temptations, they are likely to damage or destroy the spiritual lives of many more than themselves alone.
What this leads to is the notion that the Church should not knowingly admit men to the priesthood if they are inclined toward homosexuality, whether or not they intend to act upon these inclinations. That seems to be a taboo conclusion in our modern era, but I think it is the correct one.
If they haven't acted, how do you tell someone is "inclined" toward homosexuality? A fondness for French cuffs and fresh floral arrangements? Effeminate mannerisms?
Just how do you know?