1. Media might be politically biased and suffocate other political parties while always promoting the ruling party.
2. Media might be lying about what is happening to protect someone.
3. Media might be redirecting your attention to something not as important so as to hide the fact that something worse is occurring at the same time.
4. Media might attack someone and accuse them of a crime that they might not have committed.
5. The media might have lack of respect for privacy of people in their research.
Those are 5 examples of how the media can fail to fulfill such functions.