I don't think these comments deserve downvotes, and normally it's unlikely to get three consecutive "-8"'s (several days ago there was no downvote). So my conclusion is that some toxic users just gathered here and deliberately downvoted things. Maybe it is this post attracting them.
I don't care about contributions now, but I want to let everyone know this disgusting conduct. Also I think for the website it's good to show who did upvotes/downvotes. Life is not only about algorithms, but also about how to respect others (even when you are anonymous).
[Update] It seems that high-rated users have high-weights. This might make sense on algorithm discussions.