If you're the sort to believe it's just a conspiracy to make you buy unnecessary quantities of drugs, then why wouldn't you also presume that the story about antibiotic-resistant bacteria is also part of the conspiracy?
Both of them are wrong, btw. Pharma companies are greedy and they do everything they can to make you spend more. Doctors are influenced by them, often very subtly. That is a fact, not a conspiracy. But the fact also is, that doctors save lives and most have noble intentions (despite the meat grinder medical career is). One needs to learn what information belongs more to "greedy companies" category, and what belongs to "life saving science" category. It's no surprise people get confused about this - and that's why you absolutely need to explain to them why they need to finish antibiotics treatments.
It's from Friedrich Nietzsche's "Twilight of the Idols": "What does not kill me, makes me stronger."
Also, most people don't know that either. Today it's just a saying, that's been repeated by people for decades.