You walk into a store, can't find what you were looking for and leave without a word. You keep doing the same for a month, and keep blaming the store for not stocking enough items. Wouldn't just telling the seller what you're looking for benefit both of you?
That analogy doesn't really work - if they came to your site from a particular search term it would seem likely the content is already there.
Even if people are reaching a site based on a mismatched keyword, I wouldn't have thought many people check their logs and update their site because they're getting a lot of hits from a particular term they don't have much for?
True. I was kinda looking at it from my own perspective. My blog usually gets hits from people looking for "college education india". I can retarget my content towards college students, put up a few AdSense ads and make some cash. Of course I wouldn't do that, since my blog is strictly personal, but I think it's a viable strategy to drive more content towards your site.