If you don't understand the
psychological biases and heuristics that technical experts, policy - makers, and the
general public, use in thinking about uncertain risks, you won't be able to communicate effectively because people will unconsciously distort what you say to fit their preconceived (possibly faulty) mental model of the issue (see M. Granger Morgan, «Risk Communication: A Mental Models Approach» (Cambridge, 2001) for solid empirical evidence of this problem and how to avoid it.
While my observation is admittedly based on a
biased sample from couples in a private
psychological practice, it's probably true of the
general population as well.