By my experience it's used same as downvote, people just flag comments with different opinion they disagree with, while they are on topic/civil etc. Today I lea

By my experience it's used same as downvote, people just flag comments with different opinion they disagree with, while they are on topic/civil etc. Today I learned there is also Vouch button I didn't notice before, not sure how exactly it works, but it seems it allows you to respond to flagged/dead comment at least, not sure if it somnehow helps original poster.