(every comment indicating disagreement is above 15, every comment indicating agreement is below 15 and half are even negative)

This may not indicate what you think it indicates. In particular, I (and I suspect other people) try to vote up comments that make interesting points even if we disagree with them. In this context, some upvoting may be due to the interestingness of the remarks which in some contexts is inversely correlated with agreement. I don't think that this accounts for the entire disparity, but it does likely count for some of it. This, combined with a deliberate desire to be non-cultish in voting patterns may account for much of the difference.