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If you haven't actually read all of Howard's article, I suggest you do.
There are intentional trolls who tick people off because its fun for them, and those that just suck at communicating without becoming emotionally involved.
One of the reasons why I visit this site, is because of its low troll count. There are people here I sharply disagree with on many things, but we do learn quite a bit from each other in a constructive dialogue.