Overwhelmingly the posts are full of dicto simpliciter ("every school boy knows..."), biased samples, and confirmation bias fallacies. Not to mention rather thinly guised argumentum ad hominem (condescending lecturing about how simple it really is -- obviously the readers aren't nearly as enlightened and brilliant as you). And other logical and general argument fallacies, but I'm sure I'm boring the readers at this point.

The last one posted is confirmation bias combined with equivocation fallacy, by the way. Keep digging. You can always find bits and pieces to substantiate anything you'd like.

Truthiness. Great word.