Maybe hide downvotes and effects thereof of new questions for a certain limited duration, unless the downvoter comments. The downvoter would see a warning, pos

Maybe hide downvotes and effects thereof of new questions for a certain limited duration, unless the downvoter comments. The downvoter would see a warning, possibly an encouragement to post and be friendly, and the downvote would eventually count. The exact duration that's best would be unique per site and question. It should depend on how many active users the stack exchange has, the length of the posters account exists, and how many "quick downvoters" attack the question within the first X minutes. Quick downvoters could be defined as users that downvote more than X questions that have appeared on the site for less than X minutes.