I sympathize with your frustration.
I do not understand your characterization of the unlawful operator as a "pirate ham." They are not in the amateur band, and unless they are using their amateur callsign I do not understand why their separate involvement in the amateur radio service has anything to do with the matter.
I had always understood that things like high-power repeaters that are unlawful on so many counts (excessive power, band does not permit repeaters, interference with licensed services, perpetrator is qualified enough to know better) attracted enforcement interest from the FCC. Perhaps times have changed. If you were to contact the FCC with the location, frequency, power level, and typical operating schedule, I would imagine that the situation would be resolved in your favor.