we should point fingers at the real reasons for these things. And that isn't a book, it's just really bad people who want to cause pain. That's all. They don't even need a reason for it - head-in-the-sand nonsense. There're not just really bad people; they're really bad Muslims. And they have a reason for it - their interpretation of the Quran plays a big role in what they say and do. You don't see really bad Hindus or Christians joining ISIS.
Throwing the blame on the book (at least in part) has nothing to do with attacking random Muslims like that shooting by the American guy.
What he did was terrible - I hope he gets locked away forever.