Damn! I swear my spelling gets worse everyday.
I actually write "whereing" instead of wearing earlier...
Anyways...I don't think anyone is comparing the actual countries of Iraq and Germany so much as they are comparing the time and money that it will take. But, to address your points:
Firstly: The ethnic strife that exists in Afghanistan and Iraq were absent in Japan and Germany.
There was a period of ethnic cleansing in Germany if I recall...Maybe the tribalisation found in each place is different, but the animosity that one group felt towards the other was surely present.
Secondly: Both Japan and Germany had been been bled of resources by their wartime regimes.
As opposed to the 12 years of economic sanctions and theft from the Hussein regime? I would think that Iraq's economy was quite ruined.
Thirdly: Both Japanese and German citizenry had been subject to a punishing campaign of aerial bobardment that provided incotrovertable evidence that they had "lost" the war.
It was quite clear to the majority of Iraqis. If you asked an Iraqi, I will bet you that they would say that we shocked and awed them...
Fourthly: Both nations had grown weary of war and were more than ready for rebuilding and peace.
and the Iraqi's aren't? You don't think they were tired of being afraid of saddam and his regime? Tired of fearing for thier lives? They were ready for intervention.
Vietnam took place in a jungle where the MAJORITY of people hated the US. Iraq is a desert where the MAJORITY of people appreciate the US. Completely uncomparable...