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Re:Ask HN: Do you want an un-vote button? by ericfontaine on Saturday March 14, 2015 @11:20AM (#9202886)
If karma doesn't matter, then that is an argument for not having up votes for comments either.
Re:Ask HN: Do you want an un-vote button? by SamReidHughes on Wednesday March 18, 2015 @05:11PM (#9228719)
It's not like there aren't other reasons.