> This only lasts until someone figures out how they are different and breaks the association right?

Would you be OK if banks started charging you 4% more interest because say you have irish heritage? Your behaviour hasn't changed and nobody can explain why it matters that your father was irish, but the models determined it's statistically significant,

What if at some point 30 years down the line it's determined it wasn't even related to irish heritage. There was just coincidentally long running extreme predatory lending by banks in cities with large irish populations.

Would you still feel there's nothing wrong with it?