@skyblond The problem with logical systems is they are just as bias as their axioms dictate as well.
In any logical system you have your axioms (antecedent, known facts), logical rules, and your consequent (conclusion).
If your axiom includes "All black people are violent" you will have logically valid, yet racist, conclusions.
Even if you create a logic rule that is bias it can be an issue, for example "if skin color is not pale, and income is low, then high liklihood of violence" would be a rule that would add racial bias as well.