Really?
There is evidence to the contrary. For example, there was a thread here which described a female Muslim biologist who warned a colleague about active plans to produce bioweapons. As I recall she stated that Muslim women had been routinely smuggling bio-agents into the U.S. in body cavities long prior to 9/11--because they were certain they would not be searched.
And what makes anybody think that Afghanistan is the only place Al-Queda has constructed labs? And what makes anybody think they do not have the support of multiple governments (Libya, Iraq, Iran...) in developing agents?
For that matter, any of the numerous Muslim 'students' in the U.S. could be developing something nasty in a lab in a U.S. university in his "spare time"...
--Boris