Before he even had the idea of getting the Infinity Stones, Thanos' had come up with the culling solution to save his planet. He was called mad, dismissed and watched his people die.
The Infinity Stones gave him an opportunity to prove that he was right, that culling half the population would save the planets. Seems to somewhat fit in with the egomaniac persona that he has. It wasn't really about saving the world's he conquered, it was about proving to those who doubted him before.
And this can rectify how Gamora was listed as the "last of her species" in GotG despite Thanos believing he saved her world when he killed half of the population. He didn't bother to go back and check because he 'knows' his strategy was right.
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