Sorry that history doesn't fit into your world view.

According to Wikipedia, with various sources, allied forces in Italy would often ask for bacon, eggs, and cheese on noodles, called "spaghetti breakfast," so Italian chefs would modify the existing recipe for "pasta cacio e uova," which was originally without meat, to feature cured pork, thus creating the original carbonara.

I didn't see anything to specifically say whether they originally used bacon as the allied forces asked, or used other more traditional forms of cured pork from the start, but now guanciale, a cured pork jowl, is considered the traditional ingredient, though bacon is a common substitute outside of Italy.

There is an Italian historian (Alberto Grandi) that actually agrees with the POV that carbonara was invented for the american occupation and there are no source citing the recipie until the 1950s.