This is a false analogy. Economists bill themselves on being able to guide policy and large-scale decision-making given the tools and research at their disposal. If said tools and research are bunk, then the appropriate action is not to press on with guidance, but to stop with the guidance and predictions altogether. We're in the mess we're in now partly because of risk management techniques that don't work.
They aren't though. Also, it's a bit rich to blame economists when all they do is advise politicians who very often throw all the advice out the window.
