Thou Shall not Kill - Retribution
Pragmatics or the way things are to be done, will be different to suit various kinds of society. But there is nothing more odd than people, and society, and what is generally altruist may yet contain some contradictions. To be consonant or appropriate is not always to adopt the same. The Christian world must know this very well. In the past it had draconian and vicious ways of dealing with people, whilst at the same time its religion at least pretended to be altruist.
Biblically, the commandments were well enough intended but inadequate in detail. The lawyers therefore got to work and eventually every nitty-gritty of life had its regulation and transgression its retribution. A tyranny of legality, of which it appears Moslem religion is in great degree an offshoot.
The way crime is dealt with defines society as much as does its virtue. Chaos being a condition in which values have been lost, apart perhaps from a residual malice.
Where society or the state, does exist, there is no one philosophy of justice.
Whatever a tyranny or extreme authoritarian state, defines as murder, it would be consonant for it to treat the culprit virtually as a traitor, a rebel against duty. Punishment on a tit for tat basis.
Anarchistic society, in order to maintain a degree of stability, must also deal with murder as a destabilising crime. But it would be more inclined to leave justice to its component, groups and families, in a formalised way. The family that is harmed deciding on the fate of the miscreant, and perhaps carrying out the sentence. The perfect citizen as an autonomous conscience, with society as a mere aggregate of the same.
Altruist forms of society, as ever, have the most difficult decisions and philosophy. We are familiar with the aphorism that everyone is, or should be, equal before the law. But where today equality is employed in isolation, and forced on society it must give rise to absurdities, or towards anarchistic ideology. It is an ideal and, in conjunction with other values, indicates the direction of travel. However, pragmatically, there will some unambiguous equal rights. To be equal before the law, contrasts with tyranny in which some people have superior rights purely by inheritance, or by promotion to an upper class. In this it is the same as anarchism, but contrasts with it by its having minimal responsibilities. There is equality of responsibility in altruist society, relative to the capacity of the individual. Age or maturity, mental capacity, physical ability, and gender. The ideal individual which an impossibly 'perfect' society would ensure, would still have variables by age and gender - a lack of positive gender would not be a perfection. And the responsible sector of society must be protected from harm by the criminally irresponsible. Which brings to the fore how altruism deals with criminality, as opposed to criminal insanity. It does not lie in retribution, but in enforced penance. With the risks implicit in a return to normal society, in full or with limitations.
Altruism does not apply only to individuals, but also between societies albeit nation states, and to the global society of nations.