Psychosis is noisy and noticeable, where the pre-psychotic individual is usually quiet and well behaved. Of course it is, as it is the signal flag of misery. Infants born psychotic are thus because the genetic throw of the dice gave them an ultra sensitive nature, and they are doomed to live in the sheltered world they live in. Depressives recover when they change the life situation that is distressing them, sometimes with dramatic swiftness. That so many depressives do not recover but mask their unhappiness with antidepressants does not point to the illness as being intractable so much as it points to the rigidity of society.
Schizophrenics react to the same stresses as other humans, but with a stronger and quicker reaction.
This is widely recognized in giving schizophrenics a more sheltered environment, but as the press is for society to reabsorb the individual, any respite from the chemical surges is short lived. Anti-psychotic drugs simply mask the raging surges, as though the fire hose were perpetually turned on the blaze so that one can say that the fire is out. The problem here is not so much that a psychosis ensues due to life stresses as that society has rigid expectation for all its citizens. Most certainly, a fact that veterinarians will be the first to attest to. Psychotic pets, however, are usually given the life changes that are indicated, and recover.