What ought to weigh on your mind and on Obama's are the "many tens of thousands (hundreds of thousands?) of civilians" that the "moderate Islamist" we're supporting have killed and tortured.
And do keep in mind that without the interventions in Libya and Syria, Europe would not be dealing with the immigration crisis it's facing now.
To start with, 30% of the 2015 asylum seekers in Sweden were from Syria -- so that is not really the reason for the flood wave. The politicians opened the gates, it was possible to get to West Europe.
The consensus is that the Assad junta is responsible for much more death/torture than even ISIS. They have the ability to use barrel bombs and artillery on civilians.
And do keep in mind that without the interventions in Libya and Syria, Europe would not be dealing with the immigration crisis it's facing now.