 Second, after the 9/11 attack and during the “war on terror,” Camus’s writings on violence became much discussed. For example The Rebel was explored anew for hints about the motivations behind twenty-first century terrorism. Paul Berman deployed Camus in his justification for the “war on terror” against Islamic “pathological mass movements” (Berman 2003, 27–33). Foley, on the other hand, devoted attention to the actual relevance of Camus’s attempts to think through the question of political violence on a small-group and individual level. He shows how, both in The Rebel and in his plays Caligula and The Just Assassins, Camus brings his philosophy to bear directly on the question of the exceptional conditions under which an act of political murder can considered legitimate: (1) The target must be a tyrant; (2) the killing must not involve innocent civilians; (3) the killer must be in direct physical proximity to the victim; and (4) there must be no alternative to killing (Foley 2008, 93). Furthermore, because the killer has violated the moral order on which human society is based, Camus makes the demand that he or she must be prepared to sacrifice his or her own life in return. But if he accepts killing in certain circumstances, Foley stresses that Camus rules out mass killing, indirect murder, killing civilians, and killing without an urgent need to remove murderous and tyrannical individuals. These demands rest on the core idea of The Rebel, that to rebel is to assert and respect a moral order, and this must be sustained both by clear limits and by the murderer’s willingness to  die.[4]