I refuse to argue against pedantry. You knew exactly what I meant by saying "all of humanity". 0 humans alive after mass extinction on Earth = humans are extinct, humanity has ended vs 100 humans living in a space colony after mass extinction on Earth = humans are not extinct, humanity has been saved.

>The question is could you save more people in space in a hypothetical end of world scenario than you could people on Earth dying in a very real scenario today.

There is no certainty of an end-of-world scenario but there's also no certainty that a cure for cancer actually exists or would be found. There is reason to believe and enough supporting evidence that a space colony would be theoretically possible - even if not self-sustaining for quite some time. So the question is a very real fix to a theoretical problem vs a theoretical fix to a very real problem.