An opinion is usually biased. There's a reason it is not a fact.

Not exactly sure what you're trying to say. If you work in a liberal city, your opinion likely has a bias. If you are at a certain educational level, your opinion likely has a bias. If you are male/female, your opinion likely has a bias. If you were raised in a poor/rich family, your opinion likely has a bias. All your life experiences contribute to your opinion having a bias.

Well, if he works in the field, he has training, so it's more likely his opinion would be based upon Fact, rather than fear of some vague unknown like you tendered.

Or maybe they know what they are talking about?