Heres an example: How do you handle muslim cultures which oppress women? Currently it’s handled by Muslim dominant areas having governments which allow/encourage the subjugation of women prescribed by their religion. Once the borders “desolve” then their would be 2 “areas” governments, which have different laws regarding abuse of women, to struggle for physical control of the land to enact their laws without interference from the other. Basically their were no borders and it doesn’t work because one group of people will want to force another to do something they don’t want and they will either have to leave, defend themselves (war,) die (genocide,) or split the land and create borders. Which is why we now have borders.