Answer: Indifference
Eliezer Wiesel was a Jewish writer, professor, political activist and Holocaust survivor. Wiesel was sent to the concentration camp of Auschwitz in 1944, when he was fifteen. Afterwards, he was sent to Buchenwald. He lost his whole family in the camps, but Wiesel survived and he told his experiences in the book Night. Wiesel believed that the most harmful emotion is not hate, contrary to popular opinion. Instead, it is indifference. He believed that indifference is what enabled the Holocaust, and allowed it to continue for so long.