Nice post motley.    It is no surprise that people who have seen the video's of carnage and written statements of intended violence,take the threat serious.   Put in the context of religious fervor, just makes the threat of seem that much more plausible.  

If the Christian church had/has such violent sects I would be cautious with them as well, but I wouldn't propose compromising the civil rights of all Christians, based on the action of a minority.