I never really saw the point of downvotes/reduces on Lemmy and Kbin. There isn't an equivalent of those actions on other Fediverse projects (except if you count reactions on Pleroma) and it causes problems like what you have described.
I use the kbin enhancement script's option to hide the reduce button because I have no reason to touch it.
Reddit has downvotes as a means of rating down content that doesn't contribute to the discussion or is spammy, but it tends to be used as a lazy "I disagree" button that attracts bandwaggoning. Why put in the effort to explain why you disagree with something when you can just hit the down arrow and be done?
How is that API still up after this has happened?