I believe the answer is: the concept of responsible journalism by broadcasters was reinforced
During the alan scandal, broadcasters spread misinformation regarding the severity of pesticides effect on vegetables. This created a massive panick in united states, in which many establishments such as schools and supermarkets started to dump out almost all fruits and vegetables that they keep.
After the situation calmed down, the citizens directed their anger toward the broadcasters who fail to conduct a research and provide a complete information regarding the situation.