All of these examples are Ring examples, to judge the theme in the works on ME you will have to consider the Ring's nature (it simply is influential evil), and mainly the cases where there is no Ring; First and Second Age.
And where there is no Ring, people hardly change in Middle-Earth, they bear the nature of good or evil in them. Maeglin never was a jolly, virtuos, or especially noble Elf; and circumstances only brought out the evil in him. Same goes for Gollum.
Grace and pardon, sometimes transcendental, is, however, possible; even though it is logical in the context of the cosmology of ME that the really evil do not repent. Others do nevertheless: take Galadriel as a prime example, but also the other Noldor who rebelled.
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