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Some people didn't feel the crisis and made personally a lot of money at these time.
Every person who studied economics did not want to stop the economic crises.
There is good and bad people in every sector. Economy is just one of them who can have a larger impact.
Your question could be similar as this one:
WHAT IS THE PURPOSE OF MEDICINE STUDIES IF IT HAS FAIL TO STOP AID EXISTING OR EBOLAH TO KILL PEOPLE OVER THR PAST YEARS?
Some people who study medicine are looking an answer for these sickness and feel concerned, some other will be ok just to be a doctor (so they enough money to rise their children) and some will find a remedy but wait until they are assure to get a lot of money out of it before saving people's life.
Economic crises are just a tool to keep this world in 'harmony'. So people will appreciate the good economic times because they know what the crisis feels like :)