I've been downvoted a number of times for posting well-written, thought-out responses which other people disagreed with. I've often been downvoted below zero within a minute of posting, just for playing Devil's Advocate. I think these downvoters react negatively to things they disagree with, and the downvote button for them is much simpler than actually dissecting and responding to an argument.
Do we want to live in a society where even the most technically minded forum, where objective truth should stand triumphant, falls to reactionary downvoters and fake news?
Quick downvotes typically do more good than harm. In my experience both voting and receiving votes, a undeservedly grey comment gets more upvotes than a comment that hasn't been downvoted.