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I cannot even understand why some people care to join and spread these false claims here
The things you fret about are the essence of trolling. Nobody knows for sure why trolls do what they do, although it's often discussed. The usual explanation is that they seek attention, although sometimes it is obvious that they have an agenda to disrupt or to help one entity gain a competitive advantage over another.
Most people agree that the best defense is to ignore their posts. Engaging with them tends to encourage them to continue. The "ignore" button here is very helpful. However when people you don't (yet) ignore quote an ignored person's post then you still have to read the quotation. For blatant trolls who engage in tag-team-trolling or troll-vs.-troll flame wars, you'll eventually ignore all the participants and be left with a relatively normal discussion thread. It's all just part of life on the interwebz.
http://www.lowgenius.net/post/The-Way-Of-The-Kook.aspx