[BearGoesChirp]

Even if we stop all overt biases, there is plenty of sub-conscious bias that is impossible to recognize as the personal level because of how small the effect is verses the sample size (and how poor we are at doing mental statistics). Until we get to the point that we have personal AIs letting us know every time we begin to favor in-groups slightly more than out-groups, there isn't the ability to correct for this.