There are, or should be, systems to weed these types of people out before ordination.
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This is part of the chastisement that Our Lady came to warn us about at Fatima.
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The 3rd Secret was supposed to be released to the world in 1960 if Sr. Lucia had not died yet, but now it's looking like not only was the Secret not revealed, but Sr. Lucia might have died as well and if so, they hid the fact. So that makes two strikes.
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Pope John XXIII issued an official docuмent just for the eyes of bishops in about 1962, which forbade the acceptance of any seminary applicants who were known to have "ɧoɱosɛҳųαƖ tendencies." Therefore, you know that's proof positive that the problem was known to exist. If it was known by the Pope it was known by his advisers and by the cardinals. And we can't say he didn't do something about it. But we CAN say he didn't do enough about it.
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We CAN say the Church does have procedures to handle this sort of thing but Modernist popes refuse to engage the procedures.
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Pope St. Pius X wasn't afraid. Read the last 10 pages of Pascendi to see what procedures he put into operation to stomp out Modernism.
Then read the Opening Statement of Vatican II read by John XXIII on October 11th, 1962, and compare notes. Not pretty.
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So you would think the bishops would have paid attention to John XXIII when he gave them official instruction what to do about "ɧoɱosɛҳųαƖ tendencies." Well, no, actually you wouldn't think that, unless you're let's say poche or that ilk. The bishops don't pay attention to reprimands by the Holy Father unless they have TEETH and this one didn't even have dentures. So why would the bishops care what he says? What did the bishops do with the instruction? They put it on their immense book shelves and left it there. SOME copies were found decades later which obviously had not so much as ever been cracked open. Printer's resins still causing the edges of the pages to stick together. IOW the bishops ignored the direction of the Pope.
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Not only did the bishops ignore the Pope.
What the bishops proceeded to do was diametrically opposite from what the Pope had instructed.
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Seminaries all over the world turned to rejecting applicants because they did NOT have
ɧoɱosɛҳųαƖ tendencies. I can't use quotation marks because that's not what they said. What they SAID was that so-and-so seemed to lack "pastoral sensitivity." Why? Because it appeared during interviews that he had an aversion toward ɧoɱosɛҳųαƖs and therefore would not make a good pastor to care for the spiritual needs of ɧoɱosɛҳųαƖs or whatever. Not their words. Their words were: "He did not have the necessary pastoral sensitivity."
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What happened was, any seminarian who got caught praying the Rosary, studying Latin or studying the prayers of the Tradtional Latin Mass was expelled immediately -- of course, not officially for those reasons. They kept close tabs on all the seminarians and had record sheets of their performance on file, so they only had to find some other excuse for the record, like he was disrespectful of superiors, or habitually late, or didn't keep his shoes polished or didn't wear clean clothes or perhaps wore inappropriate clothing (they would change the dress code for certain events and any seminarian who did not comply with the change for that day got marked down for the infraction). But if you ask the expelled seminarian, he'd tell you, "I had been hiding in my closet to pray my Rosary and one day the Dean snuck in quietly and listened to my prayers, then opened the closet door to my surprise. Next thing you know I was officially expelled for disobedience and habitual tardiness."
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Sean Johnson started
a good thread on this very thing, how Modernism ultimately leads to Sodomy because it is the worship of false gods, and consequently carries the Romans One curse.