Bringing Conversation to a Halt

As our Blogging moves along, Comments are picking up. But I noticed something interesting. I got several responses to my "Revisiting My 'Respect' Blog." And then there was a real blowtorch ... with truly intemperate language. (Aimed at me.) There are blog sites and there are blog sites, but for us it seems that the Blast stopped the Comments cold. I'm at a loss. Our policy is that we won't drop any comment unless it's really offensive, bigoted, etc. I'm not sure what to do in instances like this. Any advice? What's your take on blogging civility?