WHEN LIFE GENERATES DEATH (LEGALLY)
Death penalty supporters find different reasons in favour of their thesis, reason of ethical, social and economic order.
They start from the supposition that the State has to defend at all costs the community and the single individuals, that those who respect the law are entitled to more protection then those who break it, that those who commit a crime have to pay for it, that there are some wrongs for which no penalty but death sentence is the right punishment.
It would be a justice demand to support their reasons.
In relation to death penalty, the theories about its function are essentially two: the retribution one and the prevention one. According to the first one, the punishment is a "damage" which intervenes as a moral and juridical reaction to the wrong committed with the crime, whose seriousness is proportionated, so that it can be considered as a moral chastisement and not as a revenge; according to the second one, the State doesn't give back wrong with wrong, but it just defends the community from the danger of the criminals, trying through death penalty to avoid that socially dangerous individuals commit other crimes.
In fact death penalty supporers give it a deterrent function, as they think that the severity of punishment is sufficient in many cases to avoid that a crime is committed: only those who act with passion don't care about the penalty provided for by the law.
Particularly, death penalty would have a preventive function against organized criminality waves that could be able to upset the social life of a State (gangsterism, Mafia, terrorism).
Besides, as it satisfies victims' and their relatives' resentment, it would remove the temptation of private revenge and the showing of social disorders.
The definitive elimination of a delinquent would avoid the recurring of other crimes from him who, though condemned, could still come back to freedom because of remissions or other mechanism provided by the law; surely economically death penalty represents a punishment system less onerous than a long detention and than life imprisonment, and then it's advantageous for the community.
The fact that capital punishment is irreparabile and that one who has been sentenced unfairly can't be refunded wouldn't be a sufficient reason to suppress it: it just has to be applied when there is the mathematical certainty of the defendant's guilt; anyway there is a further guarantee: the power of every head of state to grant the pardon if there is any doubt, commuting death penalty to life imprisonment or other prison sentence.