The observer is part of the equation

That's the problem. If the observer hasn't taken time to know themselves then they can't remove their bias because they are not aware of it. I became more aware of the influences we find ourselves subject to without knowing when I started replacing my sexual hormones and playing with my chemical balance.

Then I knew that there was no way a person could know that they are being influenced if they've always been influenced. Before that I could had swore I am always in total control of myself, now I know that I don't even know all the things that influence my every-day thinking and acting.