Back to the original point. Why is it CLEARLY the point to keep the species going? What is the reason or purpose? The earth was here long before humans and would continue long after of we die out (unless you believe some made up nonsense in a fictional text of course).
And the alternative? If you don't keep the species going then it only survives one generation. Hardly time for the primordial solution to go from a coloured water to a thick chower!!! Doesn't mean everyone has to but collectively the species tries to continue.