I don't know about that. Utopia, on paper it is perfect... but does it work in the real world... no. Here there is no such thing as perfect, there are ideals and people who try to do 'good' but what is 'good' for you is 'bad' for someone else.
if I were to ask you if you had to chose to save your own hide or your best friend what would you say? You'd sacrifice yourself for your friend. But what would you do our instincts are for survival... and anyway if you were good friends would your friend be happy for your sacrifice or would they fallow?
such is life we can say something till we ourselves are there experiencing it.
life has a cycle. even history proves it.
if these death gods were to exist in this world (just like in this manga), then there wouldn't be injustice & all sort of crimes would be diminished