Mustafa Hashim rejects accusations that his group carried out acts of violence against minorities. No ethnic or religious minority experienced violence of its doing. Instead, “the regime used chemical weapons against them.”
I don’t know how anybody (other than perhaps Israeli intelligence) could know who, exactly, is killing whom in Syria. There are different terrorist groups; some Sunni, backed by oil states, and some Shia like Hezbollah backed by Iran. Neither would, I am sure, shrink from blaming the other for their own misdeeds or even killing people for the purpose of saying the other guy did it.