"I can arrive at the same position by coldly calculating that is serves no useful purpose to exclude anyone from society / the team / the interview / my party" That's great that you can do that, unfortunately history, hell current trends, tell us that it can actually benefit many an agenda to marginalise, scapegoat or persecute the powerless and this is where legal protection comes in. This coldly calculated objectivity is a total fantasy, thus you may think arriving at that position is utilitarian, but you must on some level acknowledge that it is wrong in some respect or other, and if that isn't a moral judgement then I'm not quite sure what it is. Positive discrimination is another matter entirely, I'm inclined to agree it's totally counterproductive.