"Fear" wouldn't be the word I would use, and I wouldn't say they're mirroring discriminatory results so much as approximating reality with some level of error. Reality is not egalitarian. Good approximations of reality will probably not be egalitarian, either. A nakedly discriminatory heuristic might be a better approximation of reality than "everyone is equal." A non-discriminatory heuristic might be a better approximation than that and also have the side effect of falling very unequally across arbitrary groupings of people.