There are some very good works out there that can provide tangible benefit.
There are requirements inherent in the audience that are needed to receive benefit.
You have to be able to critically discern the misleading propaganda and other crap which many people cannot do, but some people can.
The people who are never helped, are the people who can't discern what amounts to lies from truth (without intention). Bad information may work to get a positive result in an authors circumstance, but it may not apply broadly.
People are fallible, and its important to recognize words like all, none, never, always, need to be used properly or be discarded as false statements.
Information can be valid, while not being sound.
There's so much wrong with this sentence. Like, it apparently never occurred to you some problems can't be treated by medical treatments. Instead, it's the "patient's" fault for picking the wrong book?
Or do you think they thought to themselves "This will be funny: we have this wacky character crying in the self help section, it's ironic because with all those books, she should be the person least in need of self help!"
I think it's the later. If the episode was saying something that's true, it's merely by accident.