I met Miko Peled (he was on a book tour), and asked him, “People say that Israeli Jews don’t know what happens in the occupied territories. How can that be? They serve in the army. They see it. They do it.” He answered, “They know. They just think it’s OK.”
Most people don’t know and don’t care. If American Jews, and American politicians, don’t know, their ignorance is deliberate. But some of them do know, and just think it’s OK.