Interesting to see the ability to take away downvoting is not mentioned. After downvoting one person (who made multiple offensive contributions) in a single thr

Interesting to see the ability to take away downvoting is not mentioned. After downvoting one person (who made multiple offensive contributions) in a single thread, I noticed later I could no longer downvote comments (but the downvote button still appeared). Ultimately, I think the secretive and subjective approach to moderation at Hacker News has resulted in a positive outcome, but it's still surprising to run into the limits on occasion.