Tyler Cowen nails it:
it’s not about blame one way or the other. It’s about the desire to have a fuller and better model, with richer causal chains, and to see through all the variations to a deeper level.
In addition, based on those causal chains, have a good idea of how the system will react due to a specific policy change. That is the only way policy implementations will be actually solve social problems, instead of distorting the system further.