I'm pretty sure I was also a victim, if a rather recent and relatively small scale one, and I'm glad to see something was done. However much I told myself it wasn't really important, that karma's a horribly noisy measure, with a few slightly funny comments gaining me the majority of my karma while my most thoughtful contributions usually only gathered a handful, the block downvoting really did make me feel disinclined to post new comments. Banning seems like an extreme measure, and I guess I can see where people who think there should have been warnings are coming from, but I'm actually kind of surprised that it was all or nearly all one person, and given the amount of distress it seems to have caused, I think we can do without a person like that around here, even if he did sometimes contribute good comments.