A utilitarian view of justice?

From a reader:

I am an empath who has been reading your blog with interest. I thought I'd share with you something I read recently about the Moï (a pre-modern society), from an older British book (from the 50s) about Vietnam and Southeast Asia (the book is called "A Dragon Apparent" by Norman Lewis). What's interesting about the Moï's view of justice is that it's very utilitarian and doesn't involve any special kind of outrage at anti-social activities. It's an example of a system of justice that isn't based on morality, but on expediency. Feel free to use this in your blog, if you find it interesting as I do (keeping in mind that Lewis is a journalist and travel writer, not an anthropologist).  Here's an excerpt:

"The other aspect of the Moï way of life that seems to have created the greatest impression upon those who have studied them is that, although, by Occidental standards, crimes are few, the conceptions of right and wrong seem to be quite incomprehensible to them. In their place, and incidentally governing conduct by the most rigid standards, are the notions of what is expedient and what is not expedient. The Moï is concerned rather with policy than justice. Piety and fervour have no place in his ritual observations. Contrition is meaningless. There is no moral condemnation in Moï folklore of those who commit anti-social acts.

...

"Among the Moïs retribution is swift and terrestrial. The wicked – that is, the ritually negligent man – is quickly ruined. If he continues to pile up spiritual debts he is certain of a sudden death – the invariable sign that the ghostly creditors, becoming impatient, have claimed his soul for nonpayment.

"The thing works out in practice much better than one might expect. Crimes against the individual such as theft or violence are viewed as contravening the rites due to the plaintiff’s ancestral manes. The aggressor, however, is seen as no more than the instrument of one of the spirits who has chosen this way to punish the victim for some ritual inadequacy. The judge, therefore, reciting in verse the appropriate passage of common law, abstains from stern moralization.

...

"There is no distinction among the Moïs between civil and criminal law and no difference is made between intentional and unintentional injury. If a man strikes another in a fit of temper or shoots him accidentally while out hunting, it is all the work of the spirits and the payment to be made has already been laid down."

 Excerpted from A Dragon Apparent by Norman Lewis (first published in 1951) 

I remember there was some discussion a while back about the benefits of restorative justice over retributive justice. Despite the proven benefits of an amoral justice system over one that demands blood for blood, people insist on clinging to an idea of people as being evil and deserving of punishment for the crime yes, but particularly for the temerity to challenge the conventional moral and social order.