That's be cause while 20,000 died as a direct result of the devastation, and and billions upon billions was lost and millions lives were displaced because of the matter, there is an end in sight for those people where they can rebuild. There are no concerns in the long term for their life. That doesn't make their loss any less insignificant, just their loss will not linger as long as those of the Fukushima area. Look at Chernobyl 28 years later. We still have concern for what happened there.
While I am over here in my comfy world of the US, my life was altered because someone near and dear to me was only a few miles(20) from the nuclear power plant. She continues to live there today while Japan still continues to resolve problems with the reactors. The cleanup continues. She still remembers and talks of the Earthquake she survived when she was a little kid on another part of Honshu. While we focus on Fukushima, we don't forget the Earthquake and we don't forget the tsunami. I don't forget the weeks afterward where I didn't know if I were going to talk to her again. I tried every form of communication I could. I couldn't sleep, tried to work, barely functioned. Yet what I when through paled in comparison to what she was going through. Even so, what she went through paled in comparison to people at ground zero trying to clean up the mess.
Off of my great many tangents, I will say this, we don't forget. Some might, but those who were so tied into it will not.