In short, they don't see the obvious around them because they don't want to see it, they don't want to know. They don't want to rock the boats of the powerful because they are mortally afraid the powerful will rock theirs. Journalism has become not a den of muckrakers but a refuge for the Sergeant Schultzes of this world. They go along to get along. They have learned the secret to success is to be ineffective. And how very, very successful they are.
Sad but true.