shrug not really. There's lots of people, and lots of reasons why they individually might agree or disagree. Whereas I think I'm generally right on a lot of things, I'm not so arrogant as to believe I'm universally right, or that others might hold opposing views for completely valid reasons.
Downvoting is simply that, IMHO, nothing more and nothing less than "I disagree with you".
Downvoting is simply that, IMHO, nothing more and nothing less than "I disagree with you".