Actually, there are many brilliant basketball coaching minds in Europe. The reason you don't see/hear many of them at the highest level here is the language barrier.
I must say, though, that I find the automatic connection between a German/British/Spanish/Italian accent and unique coaching insight more than a bit presumptuous.
Guess I just know too many "Americans" who know absolutely nothing about baseball/basketball/football to assume we're inherently qualified to coach those sports in Europe.