The United States has had many occasions to reflect on its failures to stand up to evil in the past.
Not standing up to Hitler in Munich in 1938 surprised even Hitler and hurried him along to his invasion of Poland the next year.
Not dropping bombs on Auschwitz in 1944 enabled the Nazis to kill thousands of victims before Soviet troops liberated the place in January 1945.
Not jamming the Hutu terrorists’ radio in Rwanda in 1994 resulted in thousands of Tutsi being slaughtered.
Standing up to the cowardly murderer who rules in Syria, with a military strike if necessary, would mean that sarin gas will no longer be used by him or anyone else. Not standing up to him is the outcome we should fear.