Prison in the Middle of Nowhere II

People always said that Death Monarch acts like a judge, jury and executioner. That he follows no laws but the laws he set himself

It is actually frightening to meet such person. Because the difference in value could mean that you in their eyes are the guilty one. 

Not to mention, Death Monarch is the strongest person in the world. 

In the real world, even if your value is different from the other person that other person could not force you to follow his values because there are other factors that restrict such a person from forcing people to follow their value

It is the law and other people who could stop such a person. 

But in the world after the Fall, who could stop someone like Death Monarch if he wishes to enforce his value upon other people?