When I was about 10 years old, my Aunt slapped me across the face for telling my mother to shut up. I can remember that to this day; I learned the hard way that telling people to shut up was socially unacceptable.
Perhaps you should watch this with mates who would otherwise tell you to shut up. Or maybe watch it in solitude and decide for yourself if you want to stand by in polite silence while history is repeated like the stanza of a bad tune.
I would agree that many Christians are afraid when it comes to Islam. If you are one of those people who call themselves Christian, and you support the import of a deadly and destructive force like Islam, you are doing yourself, your family and your community a grave disservice.