Here is an explanation of why they killed Arrigoni...
So just why did the Islamists murder Arrigoni? The answer is simple: These fanatics believe that everyone who is not a Muslim, and especially not a Muslim of their own particular fundamentalist genre, is an infidel, an enemy, someone deserving death. It does not matter in the least that the infidel in question has come to Gaza to assist the terrorists. In the case of Arrigoni, it did not even matter that he had tattoos on his body endorsing their terrorism. The “bewilderment” being expressed by the ISM and its amen chorus, along with Arrigoni’s Stalinist Italian groupies, is simply further indicative of how little these people know about the Middle East.
Yes, that is true. Sr. Arrigoni was indeed an atheist secular radical. These folks are Salafest so even if her were a Wahhabi he wouldn't make the cut. Further indication that the Paliwog Muzzies anyway are a lost cause. Their humanity is so completely distorted that they can't be recognized as part of the same species.
Yes, that's an important point. Today, there's a common enemy that loosely binds various religious and tribal factions together. But they'd kill each other if infidels weren't handy.