Your notions about "free markets" and "interventionist capitalism" are flawed. The first forays into "interventionist capitalism" (at least in the United States) in fact began in the 1890s with the Progressive period. Second, what change to the analysis would you suggest? It is simply fact that both the Depression and Great Recession were preceded by years-long period in which rising productivity was accompanied by stagnant or decreasing real wages. In each case the resultant accumulation of financial wealth had no productive investment outlet and thus went into inflating a speculative bubble. The rules that you are talking about which in fact changed how the financial system worked had been largely discarded by the end of Bill Clinton's administration.