[2] He later wrote a memoir about his time in the Łódź Ghetto and Auschwitz, called Moeder was niet thuis voor haar begrafenis (Mother was Not at Home for Her Funeral).
[13] In May 1965, Arnoni gave a speech at the 35-hour protest at University of California, Berkeley arranged by the Vietnam Day Committee, where he advocated for volunteers to join the North Vietnamese and fight against the American army.
[14] At another anti-war protest in October 1965, he wore his concentration camp uniform and told the crowd that the victims of the Holocaust would implore them "not to be silent in the face of the genocidal atrocities committed on the people of Vietnam".
[15] He engaged in a debate with Sidney Hook about the war, through a series of letters to the editor, published in the September 25 and October 23, 1967 editions of The New Leader.
[18] Arnoni was critical of negative leftist attitudes towards Israel, arguing in support of the country in his article, later expanded into a book, Rights and Wrongs in the Arab-Israeli Conflict.