[cbsmith]

That's not really a case of being biased when you don't like the result though.

That's a case of likely having a different bias than the people tuning the algorithm, and that happens all the time. You're sense of what is "correct" or "the gold set" is skewed by your own bias, and not everyone has the same bias. It's literally impossible to create results that everyone will find unbiased... and not surprisingly, the results companies end up going with are the ones that seem least biased to the people who work there.