"I hate to be racist, but it’s pretty true.
They are an extreme people as a group. Individually just fine."
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I agree. I think that the Thirty Years War messed up their gene pool regarding group dynamics:
"Thirty Years' War (German: Dreißigjähriger Krieg, pronounced [ˈdʁaɪ̯sɪçˌjɛːʁɪɡɐ kʁiːk] was a conflict primarily fought in Central Europe from 1618 to 1648. Estimates of total military and civilian deaths range from 4.5 to 8 million, mostly from disease or starvation. In some areas of Germany, it has been suggested that up to 60% of the population died."
Magdeburg suffered terribly. One of the most heinous atrocities in a land of atrocities.