I agree, but the US would have still needed a means of avoiding contagion. The free market was not up to the task.
I understand the whole mindset of "there oughtta be a law" and "the government must do something". Your statement here is perhaps the purest statement of the ideological liberal/management/fascist mantra anyone can posit.
however, it's like saying man is the relevant God, or that government is actually the relevant fundamental reality in existence. People who are sure they know what must be done will always rise up to make this argument, and have done so through the ages.
however, the statement is sheer nonsense. markets, free or otherwise, are simply the net value we place on our stuff, including our ideas. "Markets" are a fancy way of saying "Reality", and are nothing more than that, or less. If the markets can't find the equilibrium point of human values, what ever can? If the companies are in trouble, it means the owners/managers messed up, and made wrong decisions, and did wrong things. And unless they change their basic strategies or rethink their operations, they will continue to do business in ways that don't really work.
The real problem is we humans have values that are misplaced, and nobody can fix this but us. Governments, and corporations will always be slow responders to this need, and it will always work out better to allow individuals more freedom to respond, because they will always do a better job, because the fundamental fact of government or corporate hugeness is bureaucracy and isolation of decision makers, and people who are insulated from the effects of their decisions by huge reserves of capital or power will never be our best bet, as a species or as a nation.