What if correlation is causation? What if discriminating against certain traits cuts the fat more efficiently? What if it's not just about relevance to the task

What if correlation is causation? What if discriminating against certain traits cuts the fat more efficiently? What if it's not just about relevance to the task, but about the bigger picture, does the person deserve to be hired, what would they be like to work with, would they fit in with the group.. Why not exclusion for its own sake, if it produces good results? We all discriminate every moment of our lives, down to the finest choices. It is a moral good.