You’re living in a fantasy world. Attacking Iraq helped Al Qaeda, not hurt it, and even if you magically killed every memebr in Iraq and put up a magic force field to keep any Al Qaeda member out, it wouldn’t help the Sunnis, make the Sunnis any less likely to be “Talibanized”, or much of anything to stabilize “the whole Islamic world” or even Iraq; they just aren’t that important. And the vast majority of people fighting in Iraq are Iraqis, not foreign terrorists.