"one man's crisis is another man's opportunity?" this is as profound as what I read from Richest Man in Babylon which teaches that "so long as you work for money - you will keep working, the true way to riches is to make money work for you."
To your question, these cycles HAVE to happen to serve the GREED. Take out the GREED and you will take out the cycles. However, one could argue that these cycles are important to weed out the weak hands and give opportunities to those that enter the cycle!