If someone is borged, it's temporary (at least until that person shows a history of disruptive behavior).
What does reputation have to do with it? I've been borged before. Does that matter? Nope. Did it affect my (personal) reputation? Nope. Did it affect the reputation of my nodes? Nope.
You could always /msg [Power Users] Who borged me? They don't have to respond but they might if you ask nicely.
If you feel the Power Users are abusing their powers, then it becomes an issue for the gods to deal with.