When the Romans were living in cities of marble, nice houses with plumbing, toilets and sewerage systems in the streets the Barbarians were still living in mud huts wearing the same filthy fur rags every day. They had no alphabet, no stone houses, didn't believe in farming and lived only to steal from others.
European civilization comes from Greeks and the Romans. Without these 'southern Europeans' Europe would look like Africa today. And thanks to modern Germany it will look like Africa again.
When the Western Roman Empire fell to the Barbarians, Europe entered a Dark Age of a thousand years and civilization and science was forgotten, until the Renaissance which started in Italy....