I'm afraid you've picked a bad topic with which to bash the SSPX. These 3 priests from Winona were the ones who were welcomed with open arms into the diocese of Scranton where they intended to create a "medieval community." Instead they were found to be committing gross sexual imposition and almost trashed the good name of the FSSP because of their association in Scranton. The bishop of Scranton has suffered terribly over his imprudent decision to wlecome these renegades, and the only group that comes off smelling like a rose is the SSPX which kicked this guy out of the seminary twice.
I think that their sexual misdeeds were limited to sleeping in the same bed as some of their students and young acquaintances. I am unfamiliar with any actual impropriety of a sexual nature, but there were certainly other types of inappropriate behavior as well as the sharing the bed.