Do you need to have an opinion, and if so are you qualified to have an opinion? How do you develop an opinion?

When flying we don't tell the pilot to  "push that button." We don't do this simply because we are not experienced pilot for that specific plane. Then why do we allow ourselves to have opinions on economy, politics, how the country should run and so on? We can definitely have questions but not sure if our opinion would be educated enough unless we have the required knowledge and the information.
Having opinion makes us less curious.
Just because you have a reason, that doesn't necessarily make you reasonable.