Have you ever wondered if your opinion is derived from first facts or based on a biased selection of sources that you've been exposed to? Not that I am telling

Have you ever wondered if your opinion is derived from first facts or based on a biased selection of sources that you've been exposed to? Not that I am telling this is the case, but have you ever considered that? I am generally curious, because saying John Von Neumann is IYI is a very courageous proposition.