Earlier quoted context omitted.
as long as Assad was ruling Assad's secular dictatorship is massively preferable to ISIS rule, especially to the 25% of the Syrian population that are non-Sunni.
And here we have the last 70 years of United States foreign policy in a nutshell.
Western foreign policy.
And in many ways extending back well into the time of European Colonial powers carving out territory and promoting the interests of more friendly tribes/ethnicities to maintain stability and keep the money flowing.