Many people believe that whatever they are is the best in the world. Especially inbreds.
People also tend to believe that whatever they are good at makes them superior. Athletes think athletics are the most important thing in the world. For artists, it's art, for mathematicians it's mathematics.
Germans seem to be really good at engineer & science, but WWI & WWII proved that they suck at basic decision-making skills.
Of course, since all German men were removed from Germany and sent to forced labor camps between 1945-1950, all Germans born during those years were sired by foreign soldiers. Hitler's dream of a pure Aryan race was totally destroyed.
That may be the best thing that ever happened to the German people!
The fact is that Irish/English/Swedish/German/French/Italian/Brazilian/Russian/Mongolian/Tartar/Finnish hybrids are clearly the world's superior people! No doubt about it!