Only 41% of Germans have a passport. I don't see your point. We can adjust for population and the data is still clear. EU citizens would rather be in the US than the other way around. And the EU is only about 30% larger not 100%.
So now you are suddenly talking about the EU? I thought we were talking about Europe. Europe is not the same as European Union, and Europe is in fact more than double the population of U.S. Germany, being one of the most backwards countries in the entire Europe, is not a good representation of every European country.
Well, Germans without a passport can still travel all around the Europe. Passport is only needed if you plan to go outside EU - that should be a factor in this comparison.
well, first of all many European countries have IDs that are valid for travel abroad, while in the US no such thing exists. Secondly EU citizen can travel all over Europe (except Russia), in some Northern African countries and in many of the lands once a colony, such as French Antilles (or French West Indies), without a passport.