If you stop and really think how unprepared our government and industry (at least BP) was for the Gulf of Mexico oil blowout, you almost have to think about how unprepared we are for most any dire contingency, such as a nuclear strike or a dirty bomb.
The weather or a natural disaster offers a special challenge, because there is nothing you can do to prevent it. But a prepared and willing government can come to the aid of its own people or it can act woefully incompetent, as in the case of Katrina.
The right hand can not know what the left hand is doing or rival government agencies — the CIA and FBI — can allow a situation that results in disaster, such as ignoring terrorists on a watch list, thus allowing them to board and hijack airplanes and fly them into buildings, ala 9/11.
Watchdog agencies can be starved for funds and/or filled with incompetent bureaucrats who take bribes for looking the other way and not making waves, the exact thing they are supposed to do (make waves), resulting in tainted food and oil well blow outs a mile-deep in the ocean, with proper procedures and safeguards ignored, and dangerous and fraudulent financial transactions that endanger our whole economic system.
We all thought for so long that there could never really be another event like the Great Depression because we had safeguards. We shed some of those safeguards in the name of unhindered capitalism and greed some time ago, and the remaining safeguards were useless because regulators looked the other way and watched porn while drawing government paychecks and because in the end nothing really trumps greed.
A lack of confidence that our government is there for us in matters of security is enough to bring the whole system down.