+1 Powderman.
TM I'll give your questions a shot.
#1 as long as they are as radical as he is, No
#2 Bombing the ones who do not believe in their radical beliefs, or are of a different sect, Eliminates the competition
#3 Who benefits, hard to say, the installation of fear to gain converts has been played out throughout history by many regimes. A show of strength?
#4 What evidence, other than "MO", signatures,anybody could take credit for the act. But I doubtthere's more than a few sects using the practice.
#5 How come, Am I at liberty to broaden that?, El Al ticket counter in California, Jewish center in Seattle, The latest incidences in Portland,OR, The DC sniper, Ft Hood, The muslim who drove the SUV into people, etc
#6 I'll pass for now.
Sorry, mis understood #5 but I'll let my origional remain. Okay #5, I do believe that money buys immunity, enough in the contribution envelope and you get a free pass. In short, a protection racket.
I don't know if that was the tack you were looking for, but for the sake of discussion maybe that will open another angle for others to answer and hash out.