You realize that when you edit your comments, an asterisk shows up? Because I tire of your rather boring and predictable approach to Dark Arts, I'll go ahead and head this one off: I didn't downvote all of your previous posts and comments, I downvoted those here, in this post, where you were spamming. Additionally, a lazy look through your profile turns up several posts and comments which, quite definitively, were not downvoted. If your upvotes have taken a shock, it's because of your behavior, not a downvote bot.

http://lesswrong.com/lw/mvw/improving_the_effectiveness_of_effective_altruism/ for one example of a non-downvoted post from the first page of your posts. Given your rather blatant use of sockpuppets (or people from your organization told to upvote your posts/comments, which is the same thing as far as I'm concerned) for manipulating voting, the fact that it may get downvoted after I post this should not be taken as evidence by the audience of anything.

How do I know you're using sockpuppets or human analogues? Because your upvotes are consistent across a given timeframe without regard to comment quality. Which is also why you noticed the fact that some of your 4-upvote comments were downvoted, because you worked to get them to 4.

ETA: See the asterisk?

Also, any administrators are welcome to check my upvote/downvote history. If necessary I'll provide my password to an administrator to verify. (I'm not worried about being locked out of my account, because I can easily accumulate more upvotes, and anybody who dislikes me enough to want to do that probably wouldn't desire me to lose my heard-earned reputation for being an annoying blowhard.)