The real challenge is to design a system with more stability.
My opinion is that while we have had many putative capitalists in charge of regulating markets, we have very little understanding of what it takes for markets to function well. One thing missing from the debate is an interest in reducing informational asymmetries. If I have two bags of apples one paper and one see-through plastic, you are going to buy the plastic bag (environmental issues aside).
Our financial markets don't work very well, because financial accounting is the opaque paper bag.