Why is information from authoritative sources not trustworthy?

In this slide, it explains the reason why the information came from authoritative sources but still not trustworthy. The possible reason could be (1) the way information is produced, (2)carelessness or loaded with secret intentions, (3) in favour of their hidden goal, (4)not spending enough time, (5) limited topic vocabulary, (6) limited by technical barriers, (7)information that fits with your knowledge & beliefs, and (8) from a source that you think is trustworthy.