These people are acting in concert to deny some other citizens what should be a basic right: the right of free speech. There are things that shouldn't be possible to be enabled by popular vote: for example it shouldn't be possible to take the life of a law abiding citizen based on how many people antipathize him. Or to silence one for that matter.

I think that voting rings should in fact be legitimate (because they show that a piece of content is popular within a certain group of people, which is exactly the purpose of upvoting functionality), while reporting rings that obstruct some individuals liberties should be actively banned.