I've only explained it about 50 times....
There's a guy called haejin who's voting with a possibly stolen account called ranchorelaxo. He randomly votes up the top trending posts with 100% strength without reading them. I have a bot setup that does a lower value downvote to counter some of his upvote, so that trending posts don't get hugely overrewarded versus other posts.
The blockchain gives out a fixed amount of rewards, based on the token price. A downvote simply redistributes the rewards away from one post to all the other posts. So downvoting an overrewarded post just means other posters get a little more for their post. People are constantly upset about how some people's posts are constantly getting more rewards than other deserving posts. Downvoting actually counters this trend. Unfortunately, this seems to be a concept that's difficult for many people to understand.
I did not know about this topic. Thanks for the explanation.