They hide downvotes. Even the worst answers are available which I found totally wrong. They have upvotes. I downvoted them. They deserve to receive downvotes. My answers were hidden still I am shown views. I can't permanently delete my answers etc even if I delete my account. Be careful while answering here or saying here. After deletion. Person's answers will not be public and can't be accessed by person himself. Then at last maybe they will give your answer etc to someone.