I often have posts that have a downvote a few minutes after they're posted, and then gather a few upvotes some time later. You can see this sometimes on a bigge

I often have posts that have a downvote a few minutes after they're posted, and then gather a few upvotes some time later. You can see this sometimes on a bigger scale where the first few posts on an article are for some opinion, they get downvoted after some time and the new posts are all about reacting to the first posts. My conclusion is that the most active people are the most extreme, while the "silent majority" is more reasonable.