Fr Roberts does has a history. Hard to “prove” anything unless it was caught on camera

Fr. Marshall Roberts has a long history of such allegations, as others have pointed out.  They remain allegations, yes.  He's never been charged with a crime.  But they've followed him his entire career, from the very beginning when he was kicked out of an ICKSP seminary for making advances to being part of Urrigoity's cadre at SSJ, and beyond.  He either has the worst luck in the world or he is what his record suggests.
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I would also point out that Fr. Roberts has a tendency to 'remake' himself.  He is Fr. Marshall Roberts, but he is also 'Fr. Dominic of the Pillar, O.P.'  And then recently, I think, he took on a Franciscan Moniker.  Letting aside the perfectly legitimate question of who exactly received him into all of these different prestigious orders, I will instead invite questions about whether or not a stable personality would be constantly finding it necessary to remodel and refashion himself.  That kind of behavior is characteristic of ɧoɱosɛҳųαƖs.
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Nor does one absolutely need to know, with the force of visible proof, whether or not he is guilty of any sɛҳuąƖ crimes.  Prudence would suggest not to associate with such types, certainly not habitually or outside of an emergency context.  Nor is it necessary that Roberts be an unapologetic, remorseless, commitedly wicked man to stay away.  In fact, given that he continues to try to be a traditional priest, I would think that the better reading is that he struggles-- rather than gleefully accepts-- with a ɧoɱosɛҳųαƖ inclination.  But even if that's the case, it's a cold consolation and very short of a commensurate reason to trust your spiritual life to his judgment.

Are you trad Catholic? Are you Catholic at all? Why are you afraid of saying the word "fαɢɢօt"? Shed yourself of your liberal indoctrination. Are you a recent convert from the Novus Ordo?

Most fαɢɢօts still detest the word "fαɢɢօt" that justly describes them.