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Why wouldn't he go into detail? Why is everyone being so vague about it? How are we to know it isn't slander? That's all sedevacantist do is slander each other. What better way to thin the competition than by casting doubt about them with children especially little boys. You can't even find any thing not even a police report, of there's always the possibility of someone not wanting to talk but still unless someone witnessed something or was told something by a "victim" themselves than this is slander

Stop making this about sedevacantism.  SSPX and R&R have had their share of predators, some of whom appear to have been protected by the leadership there.

Yes, Quo Vadis Domine. The reputation of the sedevacantist priest and the movement in general is far more important than the innocence of the children.

The ends don't justify the means.

What a sad situation for everyone, and I understand why a parent would attempt to find answers on a forum such as this one. 

As pointed out earlier, some wolves hide in the SSPX, R&R, and sedevacantism. It seems to me that the wild-west of sedevacantism where tracing who consecrated which bishop and who ordained this priest is a dizzying path makes hiding easier. Some sedevacantist priests who call themselves independent and will offer the information of their ordination freely, but what if they are lying? There are also sedevacantist priests in the U.S. who claim to have a bishop in Mexico, or Europe and language barriers would preclude a concerned parent from making contact. Traditionalists on this forum have a wealth of knowledge and as trail-blazers and can say who is safe and who to avoid.
Therefore, we cannot judge the intention of a person asking about this or any other Traditionalist priest. If we know with certainty about a priest's character, we should comment.
Finally, if you do not know the person in question, refrain from commenting on the thread.
It would be irresponsible of a parent not to make inquiries about any adult their child comes into contact with at church, school, even their doctor.