Planning for divorce

We plan for getting married; we plan for having children.  We plan for floods and earthquakes even if they are not expected to happen in our lifetime. Given the percentage of marriage break ups, why do we not plan for divorce?

We could plan for how we will treat each other;  What we can expect; Who will keep what; How the children will be managed; What we will never do to each other…

If you cannot plan this amicably and rationally with your fiance, should you really be getting married? On the other hand, if you can safely confront this with your partner then you will probably go the distance.