Answer: 1 (terrible)
Step-by-step explanation:
The use of the death penalty by the Prince, as well as any contemporary government, as a means to enforce peace, in addition to being contradictory, is an ineffective method to enforce the law.
Not only it sends a moral message that legitimizes the exact action that capital punishment is supposed to suppress: killing people. Furthermore, if used for other kinds of crimes, it becomes terribly disproportionate punishment to any wrongdoing.
There´s even a lot of research demonstrating that the death penalty, compared to different punishments such as life or long-term imprisonment, is not more effective as a deterrent for crime.