The larger culture considered him a saint. He wasn't. One day, someone will write a good, non-hysterical book on the politics of the U.S. Holocaust Memorial Museum. On that day, we will have a better understanding of how much Wiesel defined the museum's mission. Did he really make sure the Romany would be mentioned as little as possible in the museum's exhibits? I can understand why someone with his experience would be appalled by those who equated the suffering of Palestinians in Gaza with the suffering of Jews in Auschwitz, or at least those who would make those comparisons without any acknowledgement of the problems involved with those claims. But his politics on Israel were ugly. He lent moral credibility to a worldview that has left thousands dead and will probably kill thousands more.
Many people who've read Night have gone on to defend the indefensible, indiscriminate bombings of civilians, torture, and alliances with monsters. The human race has not seen its last genocide and the Jews stand a good chance of being the victims of another one. So yes, Wiesel's life and work may have changed the world's conscience for the better...but not by much.