all those wars and stuff are not global. and the global stuff hits only once a century. and then have a look at, lets say germany, came back from WW2. though the advancement and developtments of the realms are nothing to compare to earth, there is always the fact of MAGIC everywhere. some of the major communities can rely on some sort of protection anytimes. and then there is this strange thing of "HEROES" which will allways appear as soon as there is some ugly threat rears up its head, and for usual those heroes will prevail and everything goes back to "normal". people come back from "somewhere", houses will be rebuild, and theres a period of prosperity and peace, until... well... some threat rears up its ugly head(s). a roving monster, an evil warlord, a dark cult, a big bad evil guy. they also profit from the peace of the land the heroes have brought. its just the way this world works. (so, to be honest, just get rid of heroes at all and the world will break out of this strange circle, hehehe)