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Oh, I see. It sometimes happens to me as well, and to other users. And I also tried to find out an explanation or any reason at all. Almost always those accounts have 1 or 2 posts, wrote no replies and got lots of comments under their old posts from users they have downvoted. It looks like an action without a reason. And, concerning your question you ask in the post, no one support them, but also they make no financial harm, just unpleasant feelings.
Well, consequence of democracy :)

You are right, their actions do not cause global harm, but what is the meaning of such actions? Why so mediocre to spend their resources :)

There are many weird things in our world. Many people come here and don't bother to read a line about a platform. Who knows what do that downvotes mean - annoyance, hatred or just a bad day... We just pass them by and keep going :)