She was asking about the relevance of the knowledge to the reader. If the value of the knowledge cannot be reflected in real life then is it entirely wrong to assume that people are wasting their time? And the Round Table did a great job picking up this topic with anecdotes of "fake news" or fake experts. Knowledge isn't knowledge until you use that knowledge either to do something specific (buying a million-dollar antique) or to specialize (finding further evidence to support your previous learning or contradicting evidence to reverse your previous misunderstanding). And you are right, people are free to do as they like as long as it doesn't negatively affect other people but that's not the talking point. No one here wants to legislate reading restrictions. And here's my two cents about the blue-collar worker reading management books. Admittedly not so many people experience pure joy from learning how to manage people. Even if they do, does this imply they experience pure joy from managing people, if so, is this person in the right mindset to actually manage people?