Comment by kelnos
Funny you picked 80 years. It's been roughly 80 years since members of a certain ethnic group were hunted down, corralled, and murdered because of their lineage and genetics.
And their murderers mostly only had census data and people willing to snitch on their neighbors to go on. A DNA database? Oof.
Thankfully time only goes forward and since I don't expect a large scale ethnic cleansing among the developed world since our birth rates are already below replacement I think we're fine.