"But for those unhappy ones who were ensnared by Malkor little is known for certain. For who of the living has decended into the pits of Utumno, or has explored the dark counsels of Melkor? Yet it is held true by the wise of Eressëa, that all those of the Quendi who came into the hands of Melkor, ere Utumno was broken, were put there in prison, and by slow arts of cruelty were corrupted and enslaved; and thus did Melkor breed the hideous race of the Orcs in envy and mockery of the Elves, of whom they were afterwards the bitterest foes."
On note ici que le narrateur se distancie des faits donnés "it is held true" (on pense que c'est la vérité). Ceux qui pense sont les sages d'Eressëa. Quant est-il vraiment? Que sait le narrateur, que cache-t-il? Que savait J.R.R Tolkien? Que cachait-il? On sait que la construction de la Terre du Milieu était une tâche de longe haleine et que lui-même avouait ne pas toujours savoir où il allait.
A la page 102 du même ouvrage, on lit:
"And ere long the evil creatures came even to Beleriand, over passes in the mountains, or up from the south through the dark forests. Wolves there were, or creatures that walked in wolf-shapes, and other fell beings of shadow; and among them were Orcs, who afterward wrought ruin in Beleriand: but they were always few and wary, and did but smell out the ways of the land, awaiting the return of their lord. Whence they came, or what they were the Elves did not know then, thinking them perhaps to be the Avari who had become evil and savage in the wild; in which they guessed all to near, it is said."
(Les Avari sont les Elfes qui ont refusés de fuir. Même origine donc.) On remarque que le narrateur ici se distancie "it is said".
Pourquoi? Le verbe employé est deviné (guess).
Je pense que si on savait d'où venait les orcs avec certitude, ils seraient en quelque sorte moins inquiétants...
Voilà pour le Silmarion.
D'autres sources sont possibles...
Désolé pour cette réponse digne d'un Elfe.
Amitiés,
Thorndor