You said: "monoracial as it gets when it comes to native populations of these countries."You are constantly referencing populations that have no relation to your claims. Mexicans? Chileans? Who cares? You think Baltics are 15 % middle eastern. What's the deal?
Purity has nothing to do with what we are discussing here. Scandinavians are racially homogenous to the point where each county forms a distinct genetic cluster. So are many other European countries (see the pics that were shared in last page). Whether you want to call these clusters pure or impure is irrelevant sentimentalist argumentation.
Happens that native populations of these countries are more related to populations from other locations. And that even Vikings have lots of mixtures and origins even from different continents, at their epoch.
Genetic cluster? Also occurs that people from the same cluster are as different from people from a different cluster.