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Clearly the problem he had was that he was importing creatures from Faery into his secondary world, & had to make them 'fit'. Traditional Goblins were a race in their own right & had always been Goblins, never 'corrupted' versions of other beings.
In Tolkien's world, however, everything has its origin in Eru, who is, by His nature, purely Good. Hence, if evil exists in that world it has to have come from good & devolved or been corrupted in some way ('Evil is fissiparous, but cannot create'). So Tolkien has to find an explanation for the evil beings by having them devolve from something else or be mere 'robots' controlled by the mind & will of another being (Morgoth/Sauron).
Dwarves, by their nature, cannot really be corrupted in such a way, so it would have to be Elves or Men. Men causes a problem 'philosophically' as Orcs seem to be 'supernatural' beings, inhabitants of Faery, which Men really are not. Elves becoming Orcs solves this problem, but its clear that Tolkien liked his Elves too much & was increasingly uncomfortable with them being corrupted in that way.
Of course, Elves are 'angelic' beings & Orcs could fit well into the Fallen Angel/demon role.
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