It might possibly be the case that ADHD or ADD are not "real" disorders in the way that some other conditions indisputably are. Certainly, some children and some adults have difficulty managing sustained attention and some people are 'hyperactive'. The problem with this condition is that it hasn't been fully determined whether it is a "brain disorder" or an artifact of the children are raised, or a side-effect of bad environment.
But not all mental "conditions" are vague and nebulous. Bipolar disorder, schizophrenia, psychosis, paranoia, obsessive compulsive disorder, and so on are indisputably abnormal. That said, there are psychiatrists like Thomas Szasz and others who propose radically different interpretations of abnormal psychology. Personally, I don't believe them.
That said, I also think too many people are assigned the diagnosis of "depression". Depression definitely exists, but so do a lot of other real-life situations that leave us in turmoil and which if solved, would leave us much more functional. LIKE: too much drinking, prolonged unemployment, abusive relationships, bad work-life situations, bad environments, and so forth. Too much noise, bad architecture, low grade culture, stupid art, heavy traffic, high concentrations of idiots, morons, and imbeciles per square mile, and so forth are all contributing factors. Lots of people feel dysfunctional, and are, in fact, dysfunctional -- but they are not mentally ill. They just resent living in the shit holes they are stuck in.
Could it be that our primate-brain is what has granted our kind with social characteristics? — Perrydiculous
Of course, that is precisely the case. Primates are social creatures and the primate brain is what makes us social. We are social of necessity, since we take a long time "to become" and "becoming" is a social process as well as an individual process.