This is a good idea, but I would go one step further - giving a reason should be required for downvoting, but not for upvoting. Praise is always more effective

This is a good idea, but I would go one step further - giving a reason should be required for downvoting, but not for upvoting. Praise is always more effective communication than criticism. Especially as more members join this community steps must be made to prevent the toxic downvote-to-express-kneejerk-disagreement culture that pervades Reddit.