There's a lot of wisdom going on here.
You must prepare for the worst.
10 ways to do so:- (The ticker guy in the USA, gives this advice)
http://market-ticker.org/archives/1091-Ten-Things-You-Must-Do.html
OR
Keep your head buried in the sand.
Another history lesson:-
When Germany invaded Russia, Stalin was in such deep shock, people couldn't even get him to answer the phone for 3 months. There will be a shock period. Use it to get people organised and functioning.
People are resourceful and have incredible survivability. Try and fight that, you will lose. Work with it, you too will survive.
May the Force be with you!