Where is QL hosted out of? Qatar or elsewhere? Laws vary considerably country to country, but in many common-law based countries, forums are not held responsible for the postings of the users, but there are so many exceptions and differing rules.  However, even if the mods aren't technically legally responsible, if QL is hosted in Qatar harassment would be quite easy.

 

Also, many forum's mods tend to the side of caution so that ISPs don't pull them down to avoid any legal hassles, even if the forums are well within their legal rights in that country.