Normal
As I don't watch anime I'm not familiar with the obsession you're talking about, but if it really stemmed from WWII then wouldn't there be obsession with Italy as well? I can't speak for all the Japanese people but maybe a lot of us here have traditionally associated Germany with hi-tech and have a special respect towards them. I'm sure USA and GB have had equally significant if not more impact on Japan in the westernization/industrialization process but somehow many of us have also formed this stereotype that Germans are more serious people and that somehow helped bolster our view of them having strong affinity to technology.
