Another reason is cos I'm selfish and I don't like to share what I think is right and insightful; but mainly cos I scared they are wrong and stupid, and I become the opinionated retard that I hate.
But when do we really know if we know anything at all?
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Most importantly, see the watermark? 9Gag is awesome like this; it's not a place for stupid people, much less a stupid place....
Ok I'm kidding, it's sometimes quite stupid I must admit.