Although anonymous comments are "six times more likely to be an attack," they represent less than half of all attacks on Wikipedia. "Similarly, less than half of attacks come from users with little prior participation," the researchers write in their paper. "Perhaps surprisingly, approximately 30% of attacks come from registered users with over a 100 contributions." In other words, a third of all personal attacks come from regular Wikipedia editors who contribute several edits per month. Personal attacks seem to be baked into Wikipedia culture.