My understanding was that downvoting was for comments which do not contribute to the conversation.
I'm both surprised and sad to hear that the downvote button's intended purpose is disagreement. This seems like it would discourage people from posting alternative points of view if their view is the minority.
As much as I tried looking for it on my own, I couldn't find one, so would you mind posting a source as to where the founders stated the purpose of voting?
