I was pleasantly surprised to see a few voices of sanity calling this for what it was and shooting down the conspiracy theorists. Then again, DU does have a small libertarian demographic who hangs out there and generally posts reasonably intelligent comments on certain issues.
Yes, I saw that, too, (freeper trolls?), and how they were shouted down by the voices of "liberal reason."
There were also some who honestly admitted this was black on white directed violence, but their comments on the matter was that we need to "understand" what's causing this