The outcome of regional strategic calculus and "lesser evil" mentality, especially when "the lesser evil" is "secular". Sections of the left are still in denial. How chemical weapons helped bring Assad close to victory
“The West won the world not by the superiority of its ideas or values or religion (to which few members of other civilizations were converted) but rather by its superiority in applying organized violence. Westerners often forget this fact; non-Westerners never do.” —Samuel P. Huntington, The Clash of Civilisation and the Remaking of the World Order, 1996, p. 51