Besides BinLaden was a billionaire and the Al Queda guys in the states were not poor....far from it.
Sure if their economies were growing they might not be so bitter but Islamic law forbids the charging of interest among other things. It is no coincidence that Turkey is so much better of than the other Muslim countries, they have a secular government.
You don't have to care why people of different cultures hate us, but I believe it is important to understand many of their exuses for hating us.
I agree with your conclusion about Japan and rebuilding that nation after World War II. General MacArthur did an outstanding job of rebuilding the nation. The first wise decision he made was to force the Emperor of Japan to renounce his deity or god-like status. The second wise move on MacArthur's part was to eliminate Shinto as the official state religion and secularize the new Japanese government.
To the Japanese people's credit, they cooperated well with General MacArthur's orders.