Actually, (1) is the result of vote fuzzing by reddit. They intentionally manipulate upvote and downvote numbers to obscure from potential voting rings whether

Actually, (1) is the result of vote fuzzing by reddit. They intentionally manipulate upvote and downvote numbers to obscure from potential voting rings whether their votes are effective. There are also some small safeguards in place against (2). If you literally go to someone's user page, and start downvoting every post, reddit will start ignoring your votes towards that user in actual score calculations.