"I would ask those who say that Islam is a religion of peace and that Muslims are constrained to commit no murder, how they reconcile that with current events in Syria and Iraq."

Islam/Judasim/Christianity and their legion offspring would all say they are religions of peace and tolerance, yet all are motivators in societies who use extreme violence as a tool of foreign policy. Whether they're fighting each other, their own internal conflicts or whatever all these religions claim to be the 'true' word of god and so justify their acceptance of violence.

How does any killer reconcile their core beliefs, even if contradictory, to themselves?