Not necessarily. A few scattered crazy people who don't know about each other are far less dangerous than a few crazy people all working together in support for their common crazy goal.

They are already going to know about each other; the internet is taking care of that part. Have you seen the blogosphere lately?

The one upside is that, generally speaking, after filtering everything through their One Big Idea, small crazy groups are usually too detached from reality to accomplish any real damage.