Dunno but for me it's total idiocy from RP side going back to the same system where you have been pirated once on your route. Well maybe not then when pirates claim that you safe for instance for next fer hours otherwise it's just a sign of foolishness.
I have never complained about me beeing pirated but I never came back with the same route.
Anyway imo traders are not protected by rules. For me it's just a simple, he is not answering, you are taking down his shields, one more demand and he is not answering, you are taking down almost whole his hull, last warning and he is gone. For me it's short story.