I guess it depends. If it were the beginning of my stay on this theoretical island, maybe I'd help it survive while I surveyed the island for possible sources of food and water.
If the island seems very survivable (resources are plentiful), then why not trying to raise the child, teach it what you can, and later have a companion?
If the situation is dire, and it seems like parenting is not something I can do in addition to finding the necessary survival stuff, then I'd probably want to give the child a quick death.
If its an island, and I'm the most intelligent being there, ethics and everything else go out the window. It's the United States of me. I decide what lives and dies, and that includes something like a baby. If I think there might an advantage later to keeping it alive, why not.
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