This is different from how they teach Composition 101. When you write something, the only information your reader has to work with is what comes from you. So if you expect your readers to make inferences, guesses, and assumptions to fill in the blanks, you must also accept that some of your readers are going to infer, guess, or assume incorrectly. If you cannot accept that, then as the writer it is your responsibility to be more specific.
In short: if the reader has to guess, and guesses wrong, it's the writer's fault. One of the (many, thankless) jobs of an editor is to keep this sort of thing to a minimum.