A great article on Bruce Schneier’s site about the difference between Perceived Risk vs Actual Risk.
Here’s some bullet points
# We over-react to intentional actions, and under-react to accidents, abstract events, and natural phenomena.
# We over-react to things that offend our morals.
# We over-react to immediate threats and under-react to long-term threats.
# We under-react to changes that occur slowly and over time.