As a Jew I wholeheartedly believe that, folks who are pretending nothing is wrong and Palestinians aren't being murdered every day would have absolutely ignored the Holocaust and let my folks get killed without blinking an eye.
Americans have a lot of heroic fantasies about what they would have done during the Holocaust or chattel slavery, and the answer for a lot of them is absolutely nothing. They would have complained about the people actually doing things for being too disruptive. We Jews did the Warsaw Ghetto Uprising, and they would have called this terrorism. They would have also complained about MLK and Malcolm X, the former of which took the economies of entire cities hostage. Modern day disruptions don't hold a candle to historical disruptions.
In a two of more decades, people are going to use excuses like "I didn't know!" or pretend they were supportive all along, making tear jerking films about the Palestinian plight. We need to not let them do this.