この追加の条件を考えると、もし私が超金持ちだったら、お金を使ってより多くのお金を稼ぐことになります。最終的には、人類を助けるために費やすことができるさらに多くのお金になるからです。
明らかに、これは質問の重要な側面を考慮していない例です。たとえば、人類が直面しなければならなかった非常に緊急の問題があり、私がお金を使ってより多くのお金を稼ぎ、それを助ける時間がない場合、私が現在持っているお金で人類を助けることは賢明な決定です。
ご覧のとおり、これは、答えの正しさが状況に依存する複雑な倫理的な問題です。
Given this additional condition, if I were a super rich man I would use the money to make more money, because at the end I would end up with even more money which I could spend to help humanity.
Obviously, this is just an example not taking into consideration important aspects of the question. For example if there was a very urgent problem which humanity had to face and I would not have time to use the money to make more money and then help humanity with it, it would be a wiser decision to help humanity with the money I currently have.
As you can see, this is a complex ethical question for which the correctness of the answer depens on the circumstances.