One thing the multiculturalists love to do is to downplay and outright hide the true nature of islam, as well as all the evils it is responsible for. Of course, just hiding it isn't enough; they keep trying to perpetuate the idea this islam is actually a wonderful, tolerant and peaceful religion that can't do anything wrong. According to these people, moderate muslims follow all the religion's rules properly, while terrorists apparently "aren't real muslims". Of course, truthfully, if you want an example of a true muslim, you need look no further than Osama Bin Laden.
And yes, I've seen Shutter Island, and I know that feel.