The pushback you and everyone else who refuses to give this any thought is related to the fact that you can't wrap your head around any granularity beyond "islam is islam" as if "christianity is christianity". There are plenty of justifications within any extant religious text for righteous religious murder. The overwhelming majority of that faith's practitioners eschew religious murder. And that's why Sam "religion causes murder" Harris annoys people - sure. There are sects within Islam that are virulently bad. But Islam as practiced by ISIS has as much to do with Islam as practiced by Yusuf Islam as christianity practiced by David Koresh has to do with christianity as practiced by Oral Roberts.But right now it's a Monty Python sketch where we accept any and all reasons that could explain why someone is a murderer EXCEPT FOR THE ONE THEY GIVE.