Provided that no one would know, and that the people are people that you would actually want to keep alive and not, say, someone you hate - then I don't find a real ethical problem within my own internal ethics. If the goal is to maximize potential happiness and minimize suffering, then wouldn't keeping more people alive be the more ideal outcome? Sometimes the needs of the many outweigh the needs of the few, even if neither side really knows what's best for them.
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