I think Tolkien is saying colonialism is good as long as the people doing the colonising are 'just' about it, which would fit in with the attitudes of the time. I mean nothing bad is ever said about Gondor's continued expansion into the lands of Rhun and Harad throughout the 3rd age.
Surely this land theft though would make the people whose land it was hate Gondor even more? It would create ample ground for Sauron to work with in making these people 'evil'.
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As Beren looked into her eyes within the shadows of her hair,
The trembling starlight of the skies he saw there mirrored shimmering.
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