What we need is trusting doubters
That said and as true as it is, this time around let us please make certain that what we build is some reasonably doubting trust and not that type of blind trust that could only come out of such a preposterous idea that you could leave the issue of managing risks with some minimum capital regulations for the banks based solely on one risk type, namely default, and measured over a fairly short time horizon by some humanly fallible credit rating agencies.