Copyright theft or "fair use"?

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I have just found an example of theft masquerading as "fair use" - in copyright terms. I have been writing articles on many different subjects for a number of years, and these have been published on several "writing sites". Unfortunately, these sites have a nasty habit of closing down when least expected, which means that the articles in question are no longer able to generate any income for me. I sometimes try to find a new home for an article by publishing it on a “live” site that looks as though it will be around for a bit. A common condition of such re-use is that the piece is not available on another site - this is perfectly reasonable and fully understood. That is why I always run my own plagiairism check before submitting a recycled article. It is therefore extremely annoying to find that an article of mine has been copied from its original home and re-published on a site that I knew nothing about. When this happens I write to the site owner and ask for the stolen article to be removed - I have to admit that I rarely get a reply! However, today's experience was the worst yet. The site in question - called worldhistory.us - actually has a statement to the effect that (and I quote): "This site may contain copyrighted material the use of which may not be specifically authorized by the copyright owner. We are making such material available in our efforts to advance understanding of environmental, political, human rights, economic, democratic, scientific, social justice, and religious issues, etc. We believe this constitutes a "fair use" of any such copyrighted material as provided for in section 107 of the US Copyright Law." Do you think this is fair? Because I most certainly don't!