Robar
The Enforcer
Narcissists, psychopaths, sadists or Machiavellian? When it comes to online trolls, you can take your pick: Researchers say habitual electronic provocateurs have several of these serious personality issues.
http://www.theblaze.com/stories/2014/02/17/bad-news-for-commenters-considered-trolls/
“Both trolls and sadists feel sadistic glee at the distress of others,”
This makes perfect sense.