Not just metaphorically. People are behaviorally reinforced into trolls because attention is reward and provocation gets attention. By downvoting something and commenting in reply to it, you are building positive associations to getting downvoted, a rather psychologically-sick sort of internal state that is a very bad thing to do to anyone. Would you consider it a nice thing to do to follow somebody around and give them a smile and a kiss each time they lost their temper or experienced some other failure of will, so as to reinforce that behavior? No, right?
Could you taboo "trolling". I think several distinct things are being lumped under that word. Here are the kind of posts that tend to get downvoted:
1) Simply being obnoxious, e.g., "First Post!!!!". As far as I know, these are almost non-existent here.
2) Someone arguing for a crazy position they don't believe.
3) Someone who genuinely believes a crazy position.
4) Someone arguing for a reasonable position that causes some voters to get mind-killed.
Which subset of these do you mean by "trolling" and what do you think is the appropriate response to each?
I just found out that a new website feature was implemented 2 days ago. If a comment is voted to -4 or below, it and all replies and downstream comments from it will be hidden from Recent Comments, and further replies in that subthread will incur 5 karma points penalty. The hiding, but not karma penalty, applies retroactively to comments in that subthread posted before the -4 vote.
This seems to be worth a discussion post since most people are probably still voting things to below -3 without knowing the new consequences of doing so.