[Tuor in Gondolin]

Because by accepting or tolerating their making - necessary to their actual existence - even Orcs would become part of the World, which is God’s and ultimatly good.

This observation, is, essentially, I think, "canon", and would seem
to contradict the view by many
(including but not confined to ArathorofBarahir):

The orcs had only one purpose when they were created by Morgorth and this was to aid in his desctruction and plan of taking over the world in the First Age. Since the Orcs know only one way of life, I find it very hard to see them in any way redeemable

If orc's are rational, Middle-earth creatures it would seem there
must be a possibility of redemption for any individual orc. As
individuals and a society a long period of "detox" would
presumably be necessary, but possible.