As I believe in humans developing from the primate kingdom....only 11-12% of primates mate for life. Yet, we humans, think it should last longer.
As I understand it, marriage was instituted by families to gain power, land & social influence. It was never based on love, but by what would benefit both families in this union.
But you associate the word divorce as a "mistake". Which I think most do. Does it have to be seen as a mistake? Because the criteria for a marriage equals staying together for life.
If there was like a yearly contract system maybe it would get rid of this harsh feeling of being a failure.
Idk really.