The Qu'ran says in one of its key chapters: To kill a human is like killing the whole human race.
ISIS are essentially religious outcast rebels. They're like aggressive Mormons to Christians. Or Westboro with guns. Or something. It is quite hard to explain without [TRIGGER]
Furthermore the Burka rule is out of respect for the countries own religion. France is dominantly Catholic, and much like in the Middle East where religion is held in high regard, in France you have to follow their rules to be there. In the Middle East it is required that ladies wear head dresses and long dresses, so to not reveal too much hair or legs. This is out of respect, the same for France's no burka rule, in respect for their beliefs.