Troll comments must have some redeeming quality, it doesn't need to be much at all but it has to be something, or they'll be deleted.
I was also being exceptionally liberal in allowing anonymous comments and not asking for word verification. Unfortunately some scumbag(s) have abused my tolerance. Anonymous comments are going to be turned off for a while until the troll storm passes.
Grossly abusive comments are also subject to deletion without notice.