I had a look at

http://en.wikiquote.org/wiki/The_Simpsons

Can anybody from the foundation board explain to me why these bulk of copyrighted quotes is "fair use"?

There is the general opinion at Wikiquote that the Exemption Doctrine Policy (EDP) resp. the Licensing policy is referring only to image or multi-media use. But browsing Wikiquote one has the impression that the most part of Wikiquote can only be justified with "fair use".

Klaus Graf