Accounts with zero karma don’t have the ability to downvote comments. https://github.com/minimaxir/hacker-news-undocumented#downvoting-comments https://github.

Accounts with zero karma don’t have the ability to downvote comments. https://github.com/minimaxir/hacker-news-undocumented#downvoting-comments https://github.com/minimaxir/hacker-news-undocumented#downvo... > After users reach 501 Karma, they gain the ability to downvote another comment.