Among the many arguments marshaled in opposition to U.S. intervention in Syria, a prominent one is that the chemical weapons taboo is not worth saving. Writing in Foreign Affairs last April, the political scientist John Mueller suggested that the world should “erase the red line,” since chemical weapons generally produce far fewer fatalities than conventional weapons. Echoing this reasoning, the Harvard scholar Stephen Walt asked in The New York Times last week, “Does it really matter whether Assad is killing his opponents using 500-pound bombs, mortar shells, cluster munitions, machine guns, icepicks or sarin gas? Dead is dead, no matter how it is done.” These arguments are troubling. Like the taboo against nuclear and biological weapons, the chemical weapons taboo is well worth protecting -- and inaction in Syria risks eroding it.
It is true that over the past century, conventional weapons have killed far more people than chemical weapons. But if we are keeping score, conventional weapons have also killed far more people than nuclear weapons. Nobody doubts that conventional weapons can and do kill in large numbers -- Hutu extremists in Rwanda demonstrated the lethality of even simple machetes and hoes. But nuclear, biological, and chemical weapons are labeled weapons of mass destruction because they have a higher potential to kill or wound very large numbers of people compared with other weapons. If used to full capacity and under the right environmental conditions, chemical weapons are more lethal than virtually all kinds of conventional weapons. In the August 21 attack near Damascus, sarin gas
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