Unfortunately, making policy isn't a matter of epistemology. If we prevented ourselves from making any kind of decisions due to uncertainty about our empirical claims, we would be stuck in a kind of ethical paralysis that would prevent any kind of coordinated policy.

To argue that inherent complexity means we should remain in a state of inaction is in itself a form of denialism. The fact that it is difficult to make predictions about chaotic systems does not mean that the null hypothesis is automatically true.