Researching in the field, social sampling and testing within different populations, there will always be a slight bias as objective as we want our testing to be.
I bring this up since the area of "Cognitive Dissonance" cannot truly be defined since every individual depending on their psychology, temperament, background eg class, racial-ethnic background etc can never really provide an accurate outcome of the testing.
I guess we could say that we are truly becoming more individualistic in nature, and there's not finite way of getting to the actual outcome.