Yeah, I meant it in the Chief Wiggum sense in the OP, not in the musical sense (I think there is a difference). Actually, the original use of "punk" was a prison term having some sort of sexual reference, I do not mean it in that sense.
As for "punkdom", I would say that they have qualified for punkdom. However, I would remove them from that status if they expressed genuine sorrow, turned from their ways and were willing to make restitution (even if they coulnd't make it).