Why No One Is Talking About How Bad the Japan Nuclear Disaster Could Be?

Discussion of worst-caase scenarios in Japan, including the possibility that Tokyo, a city of 13 million, could potentially become uninhabitable. This is terrifying stuff.
http://www.grist.org/article/2011-03-23-why-is-no-one-talking-about-how-bad-the-japan-nuke-disaster-coul