There are tons of answers to your questions at: http://www.physicsforums.com/showthread.php?t=480200
but there is a lot of reading, much of which is beyond me.
I'll try to give you a start. Psychological.
An event, that was planned for in most respects, occurred, 9.0 mag earthquake. What wasn't planned for was the tsunami that followed. Yes you would say that some predicted this possible event, but humans are ruled, to some extent, by the "Just World Phenomenon".
Would you willingly cross a busy street knowing that there's a real chance of getting run over. If you allowed yourself to embrace the random danger of existence you would be immobilized by fear. So we simple humans put aside our fear and cross the street every day, because failure to do so would ensure negative consequences.
It's very hard for anyone planning a worst case scenario to be objective to the (N)th degree. A hundred years from now historians may look back at our time and say, "How could have they been so careless?" They would be wrong, just as some historians are wrong in their assessment of our past. We, all of us, take our best path toward a single goal. Survival...
That's my Psychological perspective...