It gets even more interesting when you consider proxies for protected characteristics as well. It's obviously wrong for an algorithm to preferentially discrimin

It gets even more interesting when you consider proxies for protected characteristics as well. It's obviously wrong for an algorithm to preferentially discriminate for white people and against black people. It's less clear whether or not discriminating for baseball players and against basketball players is acceptable. Using sport choice in your model will necessarily have downstream effects on the distribution of outcomes on the axis of race. Any racially-correlated source of information will. And the trickiest bit is that explicitly correcting for this will often use race as an explicit algorithmic ingredient.