When we create characters we need to consider who they are in their entirety. What do they look like; how do they dress; what are their relationships with other people; and what do they want? Every decision we make is calculated.
The same might be said about individuals with a public persona. I mean publicists, PR specialists, and campaign managers all carefully craft the information flow and the appearance of those in the limelight.
That's why we're always shocked when a person behaves "out of character" (e.g. Tiger Woods, John Mayer). In writing, inauthentic dialogue and actions by a character can be downright devastating; it can make someone stop reading altogether. We know these people, don't we?
That's what's so interesting about multiple points of view: We get to know what characters are thinking and what others think about them. We understand them more fully... but what if characters just came out and said everything they were thinking? What if they explained all of their motivations? Would it be refreshing or frustrating, intimate or intimidating? I suppose it depends on who's talking.
In the case of this spoof video (once you get past the 30 second intro), it's just funny as hell: