What would it even mean for a human to be completely unbiased? We're big bags of heuristics with a thin skin of pseudo-rationality on top. We can remind ourselves to check our reasoning and maybe we'll make a habit of it but we can't unpick a lifetime of happenstance learning mixed with eons of evolved neural circuitry. We'd be better off just reminding everyone to try to be kind, have empathy and make a point of using good manners.