People who've been raised on fast/processed foods, and may never have actually done any cooking themselves, honestly may not even understand the problems with the food they're eating, or what the alternatives are. Yeah, 'home cooking' is more initially expensive (need some basics tools, place to store ingredients, keep them fresh, etc), and certainly more time up front learning how to cook certain things. But... you know what's in the food you've prepared. And you have knowledge and skills that can serve you for a long time.