Where do opinions come from?
I won’t answer that (too complicated).
Is it responsible to form opinions based on fake news? What about news that is marketed as fake, also known as freshly published fiction?
I won’t answer that either (too political).
Let’s stay within the confines of the safe, if old-fashioned, world where books are a source of knowledge, information, and formative experiences.
What happens when you pick up a book about a topic you know nothing about?
That I will answer: you incorporate what you have just read into your general sense of the world. You might also make up your mind about the book, you may—gasp!—form an opinion about the chief topic discussed.
The opinion will be based on your experiences, your background, your imagination, your state of mind at the time, all as a reaction to the book.
I call that opinion seeding.