Are you intentionally myopic? If the plant had been designed with 9.0 as the design basis earthquake, then the supports for the pumps / motors / cables / switches / diesel generators would have been rigorous enough to withstand the earthquake. If siting criteria required preparations for a 30' wall of water moving 500 mph, same thing. Of course, you may not be able to get around inside the reactor building due to all of the extra supports (think Watts Bar's U-1 containment).
The fact is that an unanticipated natural disaster has struck perhaps the most prepared nation in the world and caused thousands of deaths and billions of $ of damage. All things considered, I think the response of the systems has been excellent. If forced cooling is established this week, there will probably not be any deaths due to radiation. Much better than Chernobyl.
Actually, just the opposite.
To get to the root of the problem, you have to start with the simplest explanation and branch out from there.
Ask the 5 Why's.
Problem: Spent fuel pool is spewing radioactive material.
1-Why?
Because it is overheated.
2-Why?
Because the cooling pumps failed.
3-Why?
Because the tsunami knocked out all the power sources.
4-Why?
Because the design didn't anticipate a tsunami that big.
5-Why?






Follow that down every possible path. You'll still get the first two answers. But # 3 could be: because the terrorists destroyed the power sources - or - because the blackout and load rejection destroyed the switchgear - or - because the blah blah blah failed due to the blah blah blah.
For whatever #3 scenario that God or al Qaeda can think up for you, there is a word to replace tsunami in #4.
There is no acceptable answer to #5. Didn't anticipate something that actually happened? Why? Can't be because it was impossible. If it happened, it wasn't impossible. Where does this logically end? Build them to withstand a 9.0 earthquake, and eventually there will be a 9.1 earthquake. Build them to survive a 30 foot tidal wave, and there will eventually be a 31 foot tidal wave.
Logic doesn't enter into it anyway. We're talking about F-E-A-R. Fear knows no logic other than the instinct to fear that which we do not understand. For all the knowledge and understanding we foster, the anti-nukes will invent a new thing to fear.
It works for them. I know not why. Few if any people will die directly as a result of the nuclear plant melting down. Many people die from many other things that nuclear power would help to prevent. Still, people in California are on eBay looking for respirators and full-encapsulation HAZMAT suits.
Yeah, we'll keep explaining that to the world - the world full of people who inexplicably buy vowels on Wheel of Fortune - they won't be swayed.
"What a fool believes he sees, the wise man has no power to reason away." - Michael McDonald