Bear in mind that some contrarian statements might have been upvoted for being valuable as examples and contributions to the thread, rather than for substantial agreement. Also there is a selection effect: a contrarian sharing an unpopular opinion is very likely to upvote it when seeing a kindred spirit, but a non-contrarian who doesn't share it is unlikely to downvote it (especially in a thread like this one where the point is to encourage contrarian opinions to come out).