The title is between inverted comas because I really do not have the qualifications to use the word schizophrenia in the technical sense.
About the use of DSM I promise something for another day - someone should really explain me why pathologies come and go with the passage of time, and not the least why nymphomania is only diagnosed to women.
'schizophrenia' does not exist in the vacuum, quite the contrary, it's always the product of a social context.
Conflict at various levels is a defining characteristic of being human - and animal too.
There are the conflicts of empires (or civilizations to acknowledge the putative fashion). There are conflicts of nations. There conflicts of social groups (or classes to please the marxists - notice that my concept is at least potentially broader). Finally there are conflicts between individuals.
The boundaries are often difficult to identify. The conflict between Estaline and Hitler was at the same time the conflict between two empires - and the so called occidental world was spared a lot of suffering due to Estaline stance.
The 'schizophrenia' that I speak about is nothing more than the conflict of ideas inside the same head. A la Schopenhauer this conflict of ideas can be the mental representation of the conflict between individuals represented by different ideas in the same head.
The question is how to prevent this 'schizophrenic' conflicts of ideas, or even nations, or even civilizations? By the dialog.
The dialog requires wisdom!
When a individual loses self control because a external 'provocation' what should we do? Dialog! Whenever possible ...
But that is not easy it requires wisdom!
Often it happens that the individual suddenly becomes much more radical about something and can not contain its hanger. We need wisdom to help this (intelligent) individual!
This radicalism is nothing but the expression of fear - the suppression of one of the ideas inside his mind. The individual cannot bare the clash of ideas inside his mind - and this is obvious for those who are around and know him.
Some will bully "the(!) schizophrenic" - Isn't that the external version of the suppression! ... to hyde the inner suppression?(!)
What should we do? We know the individual, let us try to help him to accept the inner self that he is denying to himself.
When will we accept that the claim due to Nietzsche that opposites are one and the same thing is not a irrational one - sometimes on the contrary it is the only acceptable attitude.
[A long time after writing this text (10th of May 11:45 AM) I have found this fantastic text by Ivan Nunes (in Portuguese) that has some ideas similar to the ones expressed in the original version of this post, on a comment on Calvin and Hobbes by Bill Waterson. His idea is that Calvin and Hobbes are not two persons but only one, and their dialogs are "inner movements in one head". My ideas in the original text are more abstract, his post might well be more realistic.]