A huge portion of these seem to be "I don't like the fact that this heuristic is strongly predictive", not any sort of complaint about the implementation or use of the prediction engine.
Yea, I mean there's a lot of strongly-predictive heuristics that are unethical to act on, though (e.g., "if applicant is pregnant, then she will take maternity leave, and therefore be less productive employee year 1, so don't hire" Why shouldn't automated decision-making processes be held to the same ethical standards as manual ones?
I'm often under the impression that moral standards are easier to ignore if "the computer says that X". E.g. we have to accept the fact that woman is much more likely to take maternety leave, and essentially an AI is okay to be aware of that, too. It even has to, else it finds another commom factor (eg womans chess club) - but it should be able to wilfully ignore this finding because using it against an applicant is immoral.