I know of a menahel who is suffering to no end because of a false accusation. I hate his accuser, who is a true rosho that would have been a drug addict on the streets had it not been for this menahel. Then there is Joe diMaggio or whatever Deutsch’s new name is – that one robbed his own father to say nothing of making up tall tales about an unproven assault in the mikveh to justify his self-destructive behavior.
It is like the agunah “epidemic.” While one unjustly chained agunah is too many, so is one faker who is just trying to ruin her ex-husband for her own financial gain.
Those whom I listed are reshoim gemurim, on the same level as Solomon Dwek. Others whose offenses are not as numerous or as severe may be baalei tayva who are truly as pitiable as their victims. For the first, I have an answer but it isn’t legal. For the second, I don’t have an answer.