The difficult part of arguing economics is that it's a feedback loop - not even a clean loop but a messy cyclic network. One can point a myriad of direct relationships between elements of the network which are true, yet completely miss why the overall network is moving one way or another. It's not just political axe's being ground (and dismissing arguments as political is itself political), but schools of economic theory and social values. If we actually knew what to concentrate on as the root drivers of crashes - we wouldn't have crashes.