There's lots of news every day in the places I read about the earthquake and tsunami aftermath. Not so much about many other important stories - like unemployment (as Krugman pointed out today).
The Fukushima story is big news because it may have direct world-wide impact, and because it is about an invisible danger (and thus is scarier). People can and do disagree about the extent of the risk - even within the nuclear field.
Lewis's piece is yet again premature and over-sold. Nobody knows how much damage has been done to the plants. Nobody knows if the water pumps will work. Nobody knows the ultimate amount of radiation that will be released. (It took 4 years before they got a camera in the TMI core...)
My $0.02.
Cheers,
Scott.