Calor,
I don't see it the same way you do. While I'm neither left or right, I tend to have reasonable discourse with most of both persuasions. And, frankly, I see both sides as being equally guilty in their personal attacks on others.
Yes, there is a tendency of bloggers on Joeuser to be more conservative than the general populace, there is also a fairness among the admins of this site. I've seen featured articles by kingbee, myrrander, dabe, you, stevendedalus, wisefawn (back in her day), and many other liberals when the articles were well written and well prepared. But I've also seen reasons WHY "piling on" occurs.
I guess you define "personal attack" differently than I do. You see an attack against the left or your party as being a "personal attack"; I don't. I see an attack belittling you or attacking your position with NO intellectual justification as being a personal attack ("Jane, you ignorant slut!" is a personal attack"; most metaphors are not if the metaphor aptly illustrates your point).
But communication can ease up a lot of the conflict. In one response to dabe, I respectfully told her that I had a problem with the fact that she couldn't string together more than a single sentence without profanity, and guess what? In her responses TO ME (although not necessarily to others on the same thread), I find virtually NO profanity since I made that statement.
I don't see either side as "playing dirty", but I DO see BOTH sides as putting partisanship ahead of civility. If we continue to do that, it will hurt ALL of us, greatly.
Just my two cents.