Admitting to being biased is very difficult for most everyone, and it can be a bit of mental gymnastics to get there if they've never considered it as a possibility. Yet, seeing bias in others is instinctive and second-nature, done by nearly all with great ease. The average person is unable to see their favorite news channel as unbiased, and worse still all those said news channels wear "unbiased" as a perverse badge of honor.
Great post.