“…Rationalist explanations primarily focus on the limited military utility of chemical agents and the logic of mutual deterrence (Ellis and Moon, 1984; Krause, 1991; Martin, 2004a; Martin, 2016; Chapman, Elbahtimy and Martin, 2018; Allison and Herzog, 2019). In contrast, genealogical explanations highlight the gradual emergence and institutionalization of the international norm against chemical weapon-use in world politics (Price, 1995, 1997; Bentley, 2013, 2014; Jefferson, 2014; Kovačević, Afrimadona and Claar, 2019). Finally, the “essentialist” explanations put forward arguments about the deep-rooted aversion of humans to toxic substances, supposedly encoded in our genetic and psychological make-up (Mandelbaum, 1981: chap.…”