I would guess that unless there is a lot of active effort to keep guys who enjoy partaking in predatory behavior out, if we assume that such men exist, I would think that there would be some active ones in the PUA community.

Sure. If 6% of men are rapists in the general population, then I would expect 6% of PUA men to be rapists too, unless there was something actively selecting for or against rapists in the PUA set. That's just the base rate; it's no different from expecting 6% of men named "John" to be rapists.