Isolation inflates genetic purity metrics

Genetic distance to outside groups (e.g., Africans or Asians) does not cleanly measure external admixture because populations that have been isolated within Europe (Sardinians, Basques, islanders) experience drift that pushes them away from everyone, inflating apparent 'foreignness'. Quantitative checks — e.g., plotting mean FST to Europeans versus mean FST to non‑Europeans using AADR — can separate isolation (drift) from true external admixture. — This reframes headline claims about which groups are 'pure' and warns against simplistic genetic narratives that can be misused in identity and immigration debates.