>modern German bureaucracy has been built exactly by former Nazis and Stasi agents.
How frustrating for London and Washington to fight and win a war against the Nazis, then occupy (the Western half of) Germany for 7 years, imposing a new government on the country -- all to no effect.
De-Nazification effectively stopped once the US realised that Germany would be more useful as an ally against the Soviet Union, so in the first years of the new state you had former Nazis in important positions. It really was the next generation of Germans who, in the 60s, demanded more thorough denazification.
How frustrating for London and Washington to fight and win a war against the Nazis, then occupy (the Western half of) Germany for 7 years, imposing a new government on the country -- all to no effect.