Downvotes are a bad idea. We should have upvotes only.
That doesn't improve anything. I've been on sites with upvotes only and it doesn't lead to more productive discussions.
Often it results in more people posting low quality replies consisting of nothing more than "you're an idiot" because they cannot just downvote to indicate that. Meanwhile the person giving incorrect information feels bolstered by the 3 upvotes they have received that people agree with them, while ignoring the posts with 30 upvotes pointing out why they are incorrect.