Good post, but as someone who dabbles in trolling as a hobby, I'd like to suggest the following: Trolls are important. Trolling, especially as seen on places like slashdot/4chan/somethingawful/etc., can oftentimes be a mechanism of critique for ideas and rhetorical styles. One of the best things about the 'net is that, frankly, none of this really matters. None of it. It's a big joke. My twitters and my wikis and my…
On the other hand, you have people like Ted Dziuba who often provoke controversy and critique popular ideas/products. I find those critiques both entertaining and legitimate in their content.
I worry you lose a lot in a community when you rule out both types of Trolling.