Because they aren’t really “disorders” when you consider the “symptoms” in context.
One of the first things any new student in family therapy learns about is the genius of the acting-out child. Children are keen observers of the world around them: If they learn that one kind of scream or cry or tantrum gets their parents’ attention where another kind does not, they are quick to do what works and give up on what doesn’t.
Children are also, for obvious reasons, incredibly observant of their parents’ relationship (whether to each other, or in blended or single-parent families, to the new partner). For kids, seeing their parents fighting can be utterly terrifying.
Some kids, in the midst of a parental argument, learn to stay out of the way. Other kids learn, even by accident, that a very good way to get the parents to stop arguing with each other is to break rules, scream, or otherwise behave inappropriately. Here is where acting out is so smart: if both parents get angry at the kid for misbehaving, at least they
stop arguing with each other for a while.
For a child, the pain of having your parents angry at you may be far preferable to the terror experienced when watching them fight each other.
Of course, parents are often reluctant to see this. They may instead perceive such a child as “hard to handle,” “defiant,” or otherwise broken. In the worst cases, health care professionals buy into the parents’ descriptions, slapping diagnostic labels on the child. Labels like “attention-deficit hyperactivity disorder” or “oppositional defiant disorder” may accurately describe a child’s
behavior, but they ignore the
cause, and tend to focus attention on the child as the problem.
A skillful family therapist will assess not just the child but also the child’s entire social environment, including their family, to see whether the acting-out behavior is actually smart. If it is, then therapy focuses not on “curing” the acting out, but instead on
making it no longer necessary. The family therapy field is rife with stories of children diagnosed with attention-deficit disorder, childhood bipolar disorder, or other mental illnesses who are rapidly “cured” once
their parents start coming in to therapy sessions — especially if the parents are willing to work on their relationship
with each other.)
Of course, we don’t stop being impacted by our social worlds when we become adults. Just as the acting-out child is often behaving in a way that is quite smart given their environment, adults who appear to have mental illnesses may be responding intelligently to the world around them. This may mean their behavior is a response to the work environment, social circle, family, or even larger society. For example,
William Glasser suggests that at least some of the
higher prevalence of depression among women might actually be a wise response to the impossibly high demands placed on women to be successful at work, at home, and socially, always with a smile on. For women who experience that pressure intensely, and do not feel they have a reasonable way of escaping or easing it, depression can be a quite reasonable way of checking out of that chase without having to actively fight social norms. (For clarity, Glasser is not suggesting blaming the depressed for their depression; he does argue that depressive behaviors are sometimes chosen, but goes on to say these choices are often not conscious. Depression may be an adaptive response to difficult circumstances, Glasser says, but it certainly is not ideal.)
Ultimately, whether we are talking about children, adolescents, or adults, it is often true that behavior that might look troubling or even “ill” in one context is actually quite helpful in another. In fact, sometimes taking on behaviors that appear crazy to others is actually
the smartest thing to do. It’s evidence of good health and adaptability, not an underlying problem with the brain or body that any lab test could detect.
That’s why, for as much as I support the
National Institutes of Mental Health’s effort to usher in a new era of
hard science in mental health diagnosis (and usher out the behavior-based diagnoses of the DSM-5), I wonder who it will leave out in the cold. The simple fact is that many people who now (appropriately!) receive diagnoses and are eligible for insurance-covered treatment for mental disorders are not, in any physiologically-testable way, disordered. They are actually quite healthy. Their behavior makes perfect sense when understood in context.
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Therapists and counselors are increasingly required to formally gather outcome data on their work. This is good: The more data that we have on our work, the more intentional and effective our clinical decisions can become. Regularly collecting and attending to outcome data, therefore, suggests constant movement towards improvement. 
