Demons compete.  Demons extort.  Demons trade.  What are their opposites? helping, cooperating and sharing.  Angels don't  need money to want to achieve.  Angels dont errect borders and steal the earth from its natural born citizens.  Angels would not exclude humanity from its bests. You ask why world peace does not exist, i postulate there do not exist peacefuls beings to make it so.  Humanity is a new species and still instinctively goes to brutality. Until we become something new our extinction is pretty much guaranteed. Making all our earths heavens is my suggestion.