Im fairly new around here, and dont do much downzapping myself, but I wouldn't assume why someone is downzapping a post. While it could be for the reason described. I feal as though from the downzappers perspective they may just view the post as low quality, lacking in nuance, or just straight up propaganda from one side or the other. While an exaggeration, if someone asserted the earth is a inside out polydodecahedron (wouldnt suprise me in this company :p), my reaction would be to think "this person is too far gone" and to not interact with them. Some people may just use downzapping as a way to commicate that feedback without putting effort into arguing with someone they see as too far gone.

And I dont think this always manifests itself with outlier opinions like @Solomonsatoshi. Here, like any internet forum, I will occasionally scratch my head and wonder how on earth the majority of people dont even slightly understand a specific topic, without realizing that I have spent minimum hundreds of hours studying that specific topic, while they have spent their time studying others. I could easily see someone in that situation think that discussion is futile and just downzapp, and I cant really blame them given humans natural resistance to changing opinions.

With all that said, I can understand how frustrating it is to have someone state they disagree with you, and not elaborate further. Maybe it would be better to not hide heavily downzapped posts/comments, but I personally still like having some kind if indicator telling me a post is unpopular before I spend 5 minutes reading an entire slop post. Sort by controversial was always a fun feature on reddit that sorta fixed this problem, not sure if we have something similar.