That is, you're not supposed to upvote based on whether you agree with the conclusions. The same goes for downvotes, obviously: you shouldn't downvote articles or posts simply because you don't like the conclusions.

I'd guess you differ from a lot of LW here. I definitely disagree with what I've quoted...although I won't downvote you for that!

It's good to downvote comments that are flagrantly wrong or misleading, and to upvote cogent comments, and sometimes that's going to amount to downvoting because I disagree, or upvoting because I agree. Sometimes the most efficient way to handle a crappy comment is to hit it with a downvote and move on, rather than getting bogged down in an argument.