In psychology, we try to make sense of the madness of everyday life. To find patterns so that we may better understand the 'whys' behind a person's actions. For those few who are trying to find those 'whys', they must have a sort of indifference towards the experiment. When too much personal emotion is invested into the experiment, there is a higher chance that the results may be unintentionally altered to fit the theory. While the researchers try to be as un-biased as possible, it's possible that they're blind to their own mistakes.