This poll is poorly designed; karma balances often get downvoted less than the vote options get upvoted, so this will tend to over-estimate how many people no longer dissent.
For example, when I loaded this page, this comment was at 5 and the karma balance was at -3
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Actually, I think the proper case is "Two players play a one-player game they can either win or lose. One person follows, so far as able, the tenets of TDT. The other decides by flipping a coin. The coin-flipper outperforms the TDTer."
I mention this because lots of decision theories struggle against a coin flipping opponent: tit-for-tat is a strong IPD strategy that does poorly against a coin-flipper.
Is there any decision strategy that can do well (let's define "well" as "better than always-defect") against a coin-flipper in IPD? Any decision strategy more complex than always-defect requires the assumption that your opponent's decisions can be at least predicted, if not influenced.