Florence Devouard wrote:
http://commons.wikimedia.org/wiki/Commons:Project_scope
According to this page, basically anything (if free) could be hosted.
Trying to restrict the kind of opinion expressed could be problematic. For example, Wikisource could find it useful and educational to host controversial historic political texts, provided they are old and out-of-copyright, the scanned images of which would then be uploaded to Wikimedia Commons. This could include caricatures similar to those of Sharon, but a hundred years older. Wikisource can never be NPOV regarding opinion in the individual text, but must be true to the text as it was printed.