It's never been a practice of the Church to suspend a priest even after a single grave sin against his vow of chastity ... provided it's heterosɛҳuąƖ and consensual. As I noted, it's different in the case of a repeat offender, but the principle that a priest should be removed after even an isolated incident isn't indicated by Church law.
Part of what you say may be true about heterosɛҳuąƖ, consensual affairs adjudicated under Church law. I’m not a church historian or canon lawyer, so I can’t firmly refute your contention. But let’s be clear, we’re not talking about “a single grave sin against (the) vow of chastity.” In the cases of Frs. Arzuaga and Van Der Putten, we’re certainly not talking about that. They are accused of committing multiple grave sins against chastity. Hardly “isolated incident(s).” Hardly single, unrepeated events.
Since April 20, 2020, Church Militant has filed at least 30 special reports on sɛҳuąƖ perversion and pedophilia, committed by priests in the Society. Reported incidents go back to the eighties if I’m not mistaken. Again, if not mistaken, not one of those CM videos or written reports describe a one off. They all treat of multiple instances of priest perversion- some stretching over years.
These same CM articles and videos suggest that the hierarchy of the SSPX fails to act against offending priests. They fail in many instances even to discipline them, much less, remove them from the priesthood.
If CM has slandered and wrongly calumniated the Society’s good name, over and over again since April, then Superior General Pagliarani and Bp. Fellay have every right to sue and take CM to a court of law. But, to my knowledge, that has not happened. The SSPX is a pretty litigious bunch historically. They’ve not been shy in the past about going to court. Why not now?