If 'fair use' in the broad terms of American law would be available in many more countries it would make sense to allow it on Wikimedia projects, but at the moment it is an almost exclusively American law, and raises many problems on non-English projects.
Which again shows that "fair use" images are not free, applicable only on american territory, and so is again an argument to do away with fair use image on wikis in all languages, including the english language.
In another related thread it was coprrectly pointed out that there is a difference between the italian wiki and italy. I'd like to point out that there is a similar difference between the english wiki and the usa and gt britain. There is also Australia, New Zealand, Canada and India to consider, where many people have english as their primary language. Not to mention the rest of the world. :-)
teun