To short it down, the "job" of a psychiatrist is to give their patients more control over their own lives.
What does being in control of your life mean, and what is the litmus test for it.
Fat parents more often have fat kids. Are the fat kids in control of their lives?
People are more likely to be depressed if they have grandparents who are, even though they never met them. Are people with depressed grandparents in control of their lives? Same argument for depressed parents.
If you start smoking because of peer pressure, you are highly normal and living within society's norms. Are you then in control of your own life?
It is funny, if psych goal was uniformly as broad as to eliminate all signs of behavior falling outside of a precisely defined number of standard deviations from mean, then I guess objecting to stoning women in Somalia would be seen as ill, too.
- Nobody is in control of their lives, as we are products of quantum mechanical chaos. (but we need to feel we are in charge)
- There are no philosophical or quantitative ways of proving a cut-off value as to how normal one must be, my guess is that psych docs have pragmatic minimum values here, as in what type of delusions one can have without being subjected to forced therapy, and this balances self-interest and society's interests up against the wish to be the patient advocate. And to further facilitate the second, rationalizing every therapeutic measure with patient interest could be helpful. I am only guessing.
About House: I have noticed that House MD is fictional BS on many occasions when it comes to diagnostics. But I don't know that much about psychology, so I can't overrule many of the main characters comments on human behavior and human nature, like "everybody lies," but I like it. I don't know if that fictional character states that out of a will to be offensive, or if he states that out of disgust of people's need for reality cosmetics in order to remain positive. If the latter, I would also understand why he despises positivity.