It is quite clear. The FAA was designed to promote aviation, be commercial or general and to help to develope it since many years ago. It has done it quite well.
The JAA have been recently created to restrict, limit and control aviation and most important to make the most money possible from it.
I have trained and got licenses in both systems and while the FAA puts more enphasis in practice, training and simple but safe practices, the JAA puts all its weight into paperwork, theory and minimum practice.
While the FAA is clearly "non airline" aviation friendly, the JAA sees anything smaller than a 737 as an "inconvenience" that must be regulated, restricted and if possible erradicated from its skies.