Risk assessment, as practiced by the government, has been roundly criticized for depending on assumptions that guarantee exaggerated estimates of risk. In fact, that's unlikely. Far more definite action is needed to improve risk assessment. That action is to take risk assessment out of the federal government and put it in the private sector. Science and Risk Science can't solve the problems because the problems are with risk assessment, not science, and risk assessment is not science.
Science involves two processes.
The first is proposing hypotheses about how a part of the physical universe works. The second is testing the hypotheses to see if they are indeed predictive. All kinds of hypotheses can be advanced, but a hypothesis without a test has little or no value. Scientists accept and rely on the hypotheses that survive tests, and they use information garnered in the testing of hypotheses in the formulation of new hypotheses. The process continues, and hypotheses that survive testing are used to make further predictions.