I have no idea why you think in a world, where death is around every corner as is shown by the existence of devils on the streets, society would behave and work the same as in a country where you can life in peace and not fear for your life every second.
Does the police have special powers?
Does the goverment enact special laws?
Are kids taken care for normally or are orphans used by the state to fight demons for example?
How old is Denji. At what age are people allowed to work for the goverment? (In real life and in this show)
What else?
I could turn that list 100 pages long. Again - we/you are just assuming everything is the same, when there isn't much yet to suggest either side of the coin.
Denji is literally a death-row convict that can only life if he is willing to fight demons.
His rights as a human being were taken away from him right before our eyes and you are telling me society is the same?