It is not like the Republic and the World Government could not oust Death Monarch from his seat but there are too many connections involved between them.
Truth be told if the World Government and the Republic truly united, they could truly force Death Monarch to retreat and even capture him and if they truly put their mind to it even killed him
But by a twist of fate or maybe just because of the desire for men and women to have power, the Republic and the World government have divided the strongest powerhouses in the world between them.
The other that is their enemies went to other factions and organization.
And those that do not want to enter the power struggle after the vacuum of power that exist following the Fall recluse themselves on secluded area of the world.
And they have zero trust with each other. In that chaos, Death Monarch rise from its fire. Chaos is a ladder.
