When a threat to life is common, as are automobile and industrial accidents, only unusual instances tend to be prominently reported by the news media. Instances of rare threats, such as product tampering, however, are seen as news by reporters and are universally reported in featured stories. People in general tend to estimate the risk of various threats by how frequently those threats come to their attention.
If the statements above are true, those who get their information primarily from the news media tend to overestimate the risk of uncommon threats relative to the risk of common threats is most strongly supported on the basis of them.