I have a hard time believing that there are so many willing car bombers. My gut tells me that many of them have these bombs planted and are remotely detonated.
I think that's plausible. I think it's also probable that many were forced to do it, blackmail (Arab conception of honor) or threats against families compelled many PLO genocidists. I believe I recall a report of discovery of evidence that some Iraqis were handcuffed to the steering wheel.
If the terrorists have resorted using innocents and remote control then their ideological program is failing. And they're pissing off their neighbors. Terrorism works best if there's some assurance of safety to the compliant.
I tend to think this situation is like a case of seven-year itch I had many years ago. I itched for quite a while before finally going to the doc. The medicine that killed the mites temporarily made the itching dramatically worse.
I'm praying that's the situation now.