I'd rather keep downvotes disabled because we can still remove bad posts (irrelevant, spam, harassment) through mod tools. Downvotes aren't a good tool for burying bad posts if it can also be used to also harass and brigade.
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It looks like the admins at blahaj lemmy have or are working on a tool to implement downvoting, but have the downvotes weighted (the example mentioned on the thread was 5 downvotes = 1 upvote), in order to discourage brigading and other issues with downvoting. Not sure how tough this would be to implement, but it sounded like an interesting enough idea for me to want to bring visibility to it.
Personally, I voted to agree with the majority. I see the benefits of not having downvotes after spending some time here and on Beehaw, but I also think that it makes sense to include the option if most people want it.
I voted to enable because I think it's worth seeing how restoring downvotes goes, but if the feature gets abused to bully or brigade I'm all for turning them right back off. I also think that even though voting rules aren't really enforceable, it would be good to add voting etiquette to the instance wiki as a guideline to help discourage downvoting excessively, or for asking questions & other benign things.
Really I hope the ability is added to restrict who can downvote, or at least to disable federation for downvotes. That would be the best option imo.
Not sure if this is possible on Lemmy, but on HN, users don't get the ability to downvote until (I think) their account is aged somewhat or their account receives a certain amount of points.