Clearly, in this case, they did overcome the prjudice. Goldstone is no African or Chinese despot but a world renowned and respected jurist. Deal not with the assumed "prejudice" but the facts that Goldstone made public. War crimes were committed and that does not reflect on the misjudgement of Sri Lanka or Congo or Guinea or Burma. It simply means that Israel is leaning in that direction wich should surpise no one since that is the direction of all occupying regimes, as Vorwoerd of SA himself saw in Israel.
Islamist militants attack African Union base in southern Somalia (Reuters)
from the article: Goldstone's Gaza probe did Israel a favor