The chapter is the book's argument against capital punishment as an instrument of government, and it makes it in two moves.
The first is about efficacy. If the people are not afraid of death, how can you frighten them with death? A penalty works by being feared, and a population that has been driven past fear is one for which the ultimate sanction has no purchase left. Chapter seventy-two names the conditions that produce such a population, which is why the two chapters belong together.
The second move is a conditional and it is more uncomfortable. If they were always afraid of death, and I could seize and put to death those who behaved strangely, who would dare? The sentence entertains the policy rather than refusing it outright, and its force is that even in the favourable case, where fear is intact and the executions are effective, something is still wrong.
What is wrong is stated in the chapter's second half, and it is a question about authority rather than about deterrence.
The chapter is one of a small number in early Chinese writing that address the death penalty directly, and it does so at a time when penal law was expanding and states were competing in the severity and precision of their codes. Chapter fifty-seven had already claimed that publishing more law produces more thieves. This chapter takes the argument to the end of the scale.