I just remembered about one folk who would surely not use capital punishment, even though they were far less developed then others - the woses.
Quote:
They had a law against the use of all poisons for the hurt of any living creatures, even those who had done them injury, save only Orcs ~ UT, The Druedain
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This example is firstly very interesting as informtion and secondly very good to show us that we shouldn't have any preconceptions as far as less developed people in ME are concerned.
The woses were far from the social and economical level reached by Gondor or Rohan, and still, their laws were much more simple and peaceful in the same time.