I think the difference is that the rank and file are innocent followers. We thought we were serving God and so while we might have practiced evil, as in shunning, we did it because we truly thought we were serving Jehovah by doing so.The GB on the other hands is not acting out of innocence and so their evil is something we do not have to share. Their actions are made fully conscious of the fact that some of the things JW's are required to do are not bible based.