Anything positive about Europe is a negative toward the US. Anything negative about the US is a positive toward Europe. That's how they see it. By robbing the US of credit for its accomplishments (-1 pt US) and giving that credit to Europe (+1 pt Europe), Europeans are getting a two point advantage in their zero-sum quest to pretend they're superior to the US.

Due to the fact that a lot of people from European countries directly base their own national self-satisfaction on comparing themselves to the US, they have a huge incentive to lie to themselves. A lot of them would rather jump off a building and catch their nutsack on the way down than admit anything positive about the US, especially if that somehow makes Europe look worse by contrast or dependent on the US. An example of this, aside from their hilarious revision of history regarding the history and origin of the internet, is that many of them refuse to give the US credit for things like the Marshall Plan, when the US rebuilt Europe completely free of charge after WWII and restarted their economies that would have been fucked for decades without American intervention. They have a hilariously undeserved sense of superiority over the US and the way they maintain it is by raping the history of the 20th century. Oh, and there's the whole "America did nothing in WWII and just took credit after joining when the war was already won!" thing.