the exact details of EU copyright rules and lengths are probably difficult to work out, at least as difficult as saying what the laws are regarding what constitutes a felony in the United States, since that really depends on what state you're in.

But I would have to say that yes, it is mainly the EU that drives longer copyright, because EU copyright is not based on a model of doing things to help society but because there is a moral right of ownership that is possessed by the creator of a work. This of course explains why often something is out of copyright in the U.S but still under copyright in the EU but I don't think I have ever heard of the reverse applying (I'm sure HN can come up with an edge case though)