[arketyp]

> Blood type C correlates with increased shoplifting: then what?

Then you take appropriate measures, or you don't. Compare it to regular diseases. If you have a history of cancer in your family, you would probably want to go on regular screenings. Or if your family has a history of suicide, perhaps you want to pay special attention when your kids are feeling depressed.

[mdp2021]

> If you have a history ... in your family, you would probably want

That's you personally. And the law enforcement? The HR? The neighbourhood?

[arketyp]

Same problem as with all other diseases and predispositions we know of today.

[mdp2021]

So, consequently, prejudice is something that must be absolutely discouraged. In fact, you mentioned «injustice» as something to be «defeat[ed]», and that an individual can be subject to prejudice (owing to similarities to others) is radically unjust.

Edit: make the intellectual experiment, put yourself in those shoes and run the narration. It's you who has "that" trait. The law enforcement treats you differently. The HR treats you differently. The neighbourhood treats you differently. But you have your individual traits, not the virtual ones. Now put yourself in the other side: there is a trait for the median, and there is an individual there: how much should they rely on the trait of the median? Veeery relatively, and with all alert against pitfalls of bias, would not you say.

[arketyp]

I compare it to me being in a wheelchair. I would want them to treat me differently, if their actions are just (whatever that means). Perhaps I am simply more optimistic than you.