I think one problem is that people use one word, "troll", for too many different things.
We can keep using "troll" for people who are saying things to get people riled up [1]. But we need to stop calling people who pick on others "trolls" and start calling them "bullies".
And for people who post threats, email pictures of dead people to their family members [2], etc, we need a third word. I can't think of a good one, any ideas?