seems we have settled for this situation. I have an example, where I’ve written a question about the DWG intervention policy, and I quickly got two very negative replies, which we’re not allowed to downvote since there’s no 
reaction available, only 
.
luckily there was someone who dared comment “I disagree”, and he collected slightly more than the negative replies.
in my opinion the idea that not allowing to downvote is helping the mood on this site is … weird? however well intentioned, it does create the impression that everyone agrees with everything written here.
the only reaction similar to would be 
, which definitely is not the same: most often, when I disagree, I just disagree, I’m not angry … or the 
, which again is a mood.