Answer:
The death penalty is the harshest punishment that can be imposed on a criminal depending on the violation of the law he has committed: usually, the death penalty is applied to crimes of extreme gravity, such as multiple murders, for example. Even so, in most of the countries of the world, this penalty is abolished given its irreversibility.
Precisely, the main criticism of the death penalty is its irreversibility, that is, once the sentence is executed, there is no possibility of going back. Another criticism is the one that says that the death penalty avoids the deserved punishment of a criminal, such as a life in prison sentence.