My own thinking is, the really radical Jihadists can see that relatively low-level warfare is only gradually sapping their strength and while they're getting better at killing Americans, Americans are getting better at killing them too - not fun. Look at the new weapon the US has, called a SMAW or something like that, vaporizes buildings. Ow.

So, if you're a really radical Jihadist, who doesn't mind losing a bunch of your own people too, you get USrael involved in a real, large-scale war. That's the one thing that can solve your problems. No. 1, Israel gets its money and weapons etc from the US. And the US economy can't stand fighting a real, large-scale war right now. This won't be your grand-dad's war, with the US as huge oil producer and US farms and factories producing tons of the stuff needed to fight a large scale war. Today's US is a debtor nation, which produces very little, and can't afford to lose say 30% of its oil imports - or more. Sure the US can keep chugging along, but fighting a real, serious, war will mean WWII type gas rationing and so on, the conditions of a real war, and what made us stronger in the 1940s will put us in a hospital bed in the 2000s. Dollar collapse, here we come. The US in a "hospital bed" means the US unable to keep the war toys flowing to Israel, unable to keep the war toys flowing to its own troops, and the same kind of isolationism and near-revolution we had in the 1930s. The US won't be able to afford to be in the ME, we won't be under a real  Cuba style powerdown, but it will be close.

If you're a real hardcore Jihadist or just an ordinary Joe Blow in the ME you believe with every justification that it's only a matter of time before USrael wipes you out and your people so why not?