Let me be perfectly clear there are the good and the bad of every race/cred in the world, but this crap of beheading your wife for filing for divorce, while attempting to show the US that not all Muslims are bad is not only self-defeating but it's proving that these people thrive on violence. If it isn't a spouse, then it's a journalist, or the troops. And quite frankly we (Americas) have gotten way to PC over the years, a spade is a spade.
There's no logic in your argument. The man acted for himself by himself and only represents himself. Why blame a billion others for his action.
If I were to use the same argument, I'd conclude that all the British have children by age 13, all Belgians and Austrians are incest criminals, all Germans are Nazis, all Americans are Ted Bundy, etc.. But I think I'm way smarter than that.
A few remarks on Islam, a 1450-year-old religion:
* Unlike Christianity, divorce is OK but should only be the last resort.
* No human has the right to take the law by his/her own hand.
* Islam is badly represented by Muslims nowadays. A distinction between what Islam is and what Muslims do should be clearly drawn.
* Muslim civilization faded away as Muslims stopped practicing Islam.