The idea is that they'll make fewer posts if the non-trolls don't respond.
But if saying something and creating a separate comment to ask for feedback would become accepatable, the trolls will create even more visible noise before they get into obviously malicious territory.
Has anyone yet mentioned or reported that for the last couple days, the "karma for last 30 days" is showing zero for everyone? And that we no longer can see the top contributors for the last 30 days either?
Do we have an explanation or estimation for a bugfix on this?