While Aristotle was mistaken about final cause being applied to anything other than man, because only man can have a purpose, where in the world do you get the idea that Darwin claimed that the nature of life per se was to reproduce? He described how it is that in reproduction certain biological traits are handed down to the off-spring, and that over time the off-spring, having a few differences from the parents, can become a new species. I don’t think he said that the goal of life was reproduction. In fact, his theory of evolution rests on the idea that each living being does what it can do with what it has biologically to survive and to flourish.
Each organism competes to reproduce. For the ones that do not, they die and do not pass on their genes. When you say “do with what it has biologically to survive and flourish” implies that an organism uses its reproductive capabilities for its genes to survive and flourish, not that organism itself surviving and flourishing. Just as an apple lives as a uterus for apple seeds, any organism lives as a casing for its genes, moving them from place to place until they are ready for interaction with complementary genes.
The consciousness we possess is the product of a long development of evolution; the conception of rationality we derive and are so proud of is simply an enhancement of a faculty purposed as a vehicle for the purposes of copulation.
Besides that, if the final goal of an individual life form was to reproduce, that would not be a form of egoism in any rational sense of the word.
I meant ‘egoism’ in the sense that “I must survive so that I may pass on my genes”, a selfish motivation of fulfilling a biological function. I made no assertion that it is rational.
The implication of your stance is that once a living being reproduces, it has fulfilled it’s life’s goal and no longer needs to live. And further, that if an individual does not reproduce, then that individual has not fulfilled his role as a living being. As you may well know, Ayn Rand had no children, so by implication you are saying she was not a worthwhile human because she didn’t fulfill her biological necessity. In other words, by your standards as stated, you are saying that Ayn Rand was worthless and didn’t accomplish anything. The facts clearly show otherwise.
Presenting objections such as these does not weaken the claim.
Reproduction is just one of the things that a living being can do – it is not the final goal of being alive. The final goal of being alive is being alive and flourishing as that living entity – and there is no obligation to reproduce, morally or otherwise.
To say that reproduction is simply an ability and not a necessity is another comparison fallacy. Organisms outside the human realm exemplify the error in your claim: reproduction is not simply “yeah, I’ll do it if I feel like it” or “yeah, I’ll do it once I find the right partner”. It is a biological necessity, an instinct. Humans have lost the necessity thereof through time, but this is an invalid comparison.
Rational egoism, which only applies to man, means living one’s life to the fullest using the utmost of one’s rational powers to live as well as he can. Life is self-sustaining, self-generative action for all living beings, but only man can do this purposefully and of his own free will.
Ultimately, a human being is a rational animal. Humans defecate, sleep, and breathe as animals do, we are a product of evolution. Man may be different in many aspects from his ancestors, but this does not make Rand’s theory of life being an end in itself any more valid than one’s life being a means in itself.