Financial crisis == moral hazard. And, come on! There's an economic theory that predicted the crisis, and explains it. I.e. ABCT (Austrian business cycle theory). My point being, it's not as clear cut when there's 'crony capitalism' and other market distortions.
'Free', as in freedom!
Everyone knows the 'free market' is made up of individuals. Or groups of individuals, such as a firm, which is formed to reduce transaction costs -- as per Coase's description in his Nobel winning (1991) The Nature of the Firm (1937).
Money is a medium of exchange. We use it to trade. And by definition: when people trade freely, they are both better off (otherwise they wouldn't trade!).
Money also has the functions of 1) store of wealth 2) unit of account. But that's by the by.
Problems are always going to occur, but because humans are motivated to solve the problems, solutions are found. And a profound way to facilitate such solutions is a market-based economy.