Discussion of an article's accuracy is what the comments are for; downvotes are a pretty bad indicator of this as they're largely used to indicate agreement with the post's title (which may include disagreeing with it's accuracy, message, vibe, spelling, etc.)

People also just downvote stuff they disagree with. If you use the downvotes on a post or comment as the indicator of whether it's correct or not you'll just end up believing only the things the majority of the users believe are true, instead of using evidence or any kind of facts.