I have suggested that more than once over the past few years, but to no avail. When the are ignored, they go away. Its been done on a small scale, but some new poster inevitably responds to an inane posts not knowing the poster is a troll.
We need NOT to post, reply, to them or even acknowledge their presence.
I personally think this approach does show the "casual lurker" that their(trolls) ideas are whacked-out, and not considered by freepers who post rational arguments based upon freedom, liberty and personal responsibility and not nani-ism, authoritarianism and socialism.
If we were to ignore all the trolls we would be preaching to the choir 99% of the time.