The reasoning of most of the people on this site and at MIRI is that to prevent an AI taking over the world and killing us all; we must first create an AI that will take over the world but act according to the wishes of humanity; a benevolent god, for want of a better term. I think this line of thinking is both unlikely to work and ultimately cruel to the FAI in question, for the reasons this article explains:
http://hplusmagazine.com/2012/01/16/my-hostility-towards-the-concept-of-friendly-ai/
Yeah, I'm not very good at the internet, I didn't realize deleting articles apparently means nothing on this site
Deletion removes links to an article from all the usual places, but if someone already has the URL they can still go there. And some people use RSS readers, which get notified of new articles and store them outside the site's control.