I would posit that some people down vote either because they:
1. Don't like the post because something is wrong with it (don't agree with the opinion, think it's misinformation, etc).
2. Didn't understand the post and accidentally think it's bad.
3. Do it as a troll.
I've had perfectly valid posts that were down modded and I assume that in those cases it was a trollish behaviour.
"The doktor is in."
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