Note their appearance and behavior - mildly neurotic. Slightly OCD. Pleasant. He's positively excited about finding a solution. And though said solution is played over the top for laughs, and the housewife is horrified, I can tell you that the Germans - mostly engineers - I know tend to fit this profile. Very pleasant Will avoid rocking the boat. If they have a nice car will park it around the back or in the garage because showing off even moderate wealth is considered tacky. And if they decide to do something about a problem, once it has awakened their ire, they will very matter-of-factly, very totally, make it go away. When they commit to something, they can be a bit... extreme.
In the same vein, this recent article at Gates of Vienna - "When a German is Aggravated Enough, a German Strikes” (with translation below):
The following video was made by a German YouTube satirist named Hagen Grell. Despite the humor in it, his entertaining rant has an edge — it expresses a fundamental truth about the hidden undercurrents of German culture, using satirical means.