I know you are right - look at the Unabomber, and the radicals of the 60's. But there are fewer of them than there are of us. I also know it just takes one bomb, or WMD (bio or chem), to wipe out a lot of guns and the people who hold them.
Yep. Just imagine 20 or 30 active Mohammed and Malvo-like teams, and a Madrid type bomb going off every week. That's what a dirty war might look like.