Impartiality is a myth. So the idea that you will start with an impartial jury or fact finder (maybe a Judge) misses the mark. We all have inherent bias and prejudice that colors our decision making. All of us.
Let’s start with a simple example involving cars. I have a bias (or preference) in favor of Westfalia vans and Porsche 911s. The two are polar opposites – sexy German sports car and utilitarian German fun wagon. If I had both in my garage I would be a happy camper. Over time I have had both but modern automobiles have taken my eyes away from each. So too the two grandkids I cart around daily.