[VoodooJuJu]

I agree, and I think I have a potential solution, although it would require additional moderation efforts.

Every downvote must must be accompanied by a comment. That comment is bound to the downvote, and whether that downvote is counted is contingent on the quality of the accompanying comment.

The accompanying comment must give supporting reasons for the downvote. If the comment is something along the lines of: "I disagree", "NO U R DUMB", "asdfasfdasfd", or is blank, then that comment's downvote can be flagged for review, and ultimately discounted.

A good accompanying downvote-comment should do something like: (1) point out logical errors or fallacies in the parent comment (2) point out logical or methodical errors in the parent comment's sources. [1]

I'm sure we'll get some mental gymnasts who try to twist things, but with this system, the added friction with downvoting should reduce the number of "I disagree" downvotes by a meaningful amount.

[1] edit: even this can be a problem though, because these kinds of logical or methodical refutations can be insightful to some people, which they won't see if the downvoted comments fade into the abyss