A human keeps evolving mentally, there comes a stage where he is happy with whatever he has got and is content, nothing of material attracts him anymore, the desire for matching with neighbor or having more than his own brother dies down and looks childish ........ this applies to all "Zan, Zar, Zameen". People who evolve find themselves living in a paradise sort of environment "Hasad aur bughz say bala aur bayfiker pursakoon", and the ones who don't well they make their own lives hell. Death is an evolution, you start taking lead and progressing while you are in this dimension, there is a reason heaven may have classes. Islam tried teaching humanity its own potential and its own true purpose .... some accepted, some accepted halfheartedly and others manipulated ....
If our own conditions that we live in haven't taught us anything, a war won't make much difference, it would be back to being what we are ..... desire for Pakistani nukes going hot ... gets repeated everyday here on this forum. Plus the only lesson can be learnt when your adversary has been imposed directly by the ALL MIGHTY ... our current foe is more backward and superstitious than us.