When a newcomer starts trolling the site, they could very easily have a full corpus of contribution of, say, six posts, all of which are unambiguously worthy of downvoting. A rule which institutes a blanket prohibition against downvoting all of someone’s posts isn’t robust against circumstances such as those.
A possible solution would be to require one to solve a captcha, and to notify an admin, when someone downvotes more than 10 comments/posts by the same author in a one-hour period (or something similar).
When a newcomer starts trolling the site, they could very easily have a full corpus of contribution of, say, six posts, all of which are unambiguously worthy of downvoting. A rule which institutes a blanket prohibition against downvoting all of someone’s posts isn’t robust against circumstances such as those.
A possible solution would be to require one to solve a captcha, and to notify an admin, when someone downvotes more than 10 comments/posts by the same author in a one-hour period (or something similar).