Searching on "Herbal Cures" for example is just a stepping stone to actual action, isn't it? I mean would anyone actually act on something they read on the Internet? Even if it said is was from a doctor?
The "Herbal Cures" lookup in the library's subject catalog was for illustrative purposes in response to the "would you blame the library" question. Replace it with the subject of your choice and the argument is still valid.
Librarians know that when we use a subject index, we don't usually want to see lists of other indexes. And when we do want to see other indexes, we can just look under the "indexes" subject. They organize their subject catalogs accordingly.
They don't stick 20 to 40% of the cards into misleading or random places to try and confuse people into actually pulling useless books off the shelves so that ads drop out of them.
And they don't pull covers off of classics and bestsellers to wrap them around ads.