Some people (my old Uncle Percy was one) absolutely adore having a real argument (not discussion) and the deeper it descends into a row the more they like it. When he and his son got together, it nearly ended in blows, and afterwards they both felt tremendously refreshed. We can't expect everybody to prefer an earnest debate on civilised lines. I try (not always successfully) to tolerate others' styles, but find trolls just plain weird. For instance on another thread, a man is asking for support after his wife suffered a heart attack in the night. She's gravely ill and he's beside himself. A troll actually posted a taunting message complete with a coloured moving logo for him to see. Now that IS wicked and evil.