Different countries have different constitutions and they follow different rules and regulations to deal with crimes. Some nations are quite rigid in dealing with some particular crimes and they follow law and order like tooth for a tooth and eye for an eye.
Before talking about the essential role of the death penalty, you have to think about the meaning, and the purpose, of any kind of punishment. If you consider that the purpose is to prevent the guilty from being nasty again, you can be seduced by an argumentation in favour of the suppression of capital punishment.
I thoroughly agree with the proposition - capital punishment should be made mandatory in our society, where crime ratio is being increased day by day because we live in a world where people are not even certain about how they are going to return, either on legs or on shoulders.
Nowadays, the crime rate is accelerating according to many surveys. To rein this situation, there should be a mechanism in place like jail for lifetime and death penalty based on the severity of the crime.
Before starting the discussion on the essential role of death penalty or life sentence, we have to think about its meaning, purpose and factors behind the crime. In our society, people do crimes for the sake of their needs and sometimes for fun and also for the satisfaction of their emotions.