In the same episode, Galadriel (Morfydd Clark) suggests eliminating the species altogether with a move that, based on the film’s more sympathetic setting of orcs, leads to genocide. Although it was a horrible plan, it didn’t quite fit the conventional notion of orcs as mindless but certainly harmful creatures whose functions only served the dark. So were all the Orcs slaughtered at the end of the Third Age?
Not exactly, though, with their leader Sauron being good and actually leaving at the end of “The Return of the King”, they don’t fare much better. This is what Tolkien wrote in “Return of the King”, describing the consequences of Frodo and Sam destroying the One Ring:
“Just as when death hits their crawling hill-dwelling brood and makes them all sway, ants will wander aimlessly and then die weakly, so the Sauron’s creatures, orcs or trolls, or beasts enslaved, run away and heartless; and some kill themselves, or throw themselves in pits, or flee and return weeping to hiding in pits and dark places without light, far away with hope.”
So basically, empathize and personalize as Adar makes the sound of the Orcs as he tells Galadriel that “everyone has a name, a heart”, the dark fate that his race has they will meet thousands of years later still shows their lack of self-control. Orcs are essentially mind-controlled, and when the last bit of Sauron’s power is gone, they lose control to continue. However, the word “some” here implies that there are orcs that may have lived past the expiration date mandated by Sauron, but if they did, we wouldn’t say what their life looked like. .
https://www.slashfilm.com/1034648/what-happened-to-the-orcs-after-saurons-defeat-in-lord-of-the-rings/ What happened to the Orcs after Sauron’s defeat in The Lord of the Rings?