Not necessarily, but I would argue that the karma score is there to suggest that his comments should be treated more seriously in general, since karma is meant to be a signifier of 'quality.' It's an easy (and deceptive) metric to determine who in any argument should be listened to and who shouldn't. Although his having that much karma might mean his upvotes and downvotes count more which to me would be a bigger problem for the fairness of the forum in general.

I would be happy if Hacker News got rid of karma entirely, but that seems unlikely. The next best thing at least would be to just not have the numbers there at all.