I think we are all familiar with the basics of Dawkins's theory of evolution. In a nutshell: All creatures are nothing but vehicles of genes with the sole purpose of passing through these genes, and in the case of human beings besides genes also memes are involved.
Isn't this interpretation of evolution circularly: "Why do all organisms exist? Because the purpose of organisms is to pass on genes which have the ability to develop new organisms, thereby creating new organisms under all kinds of environmental pressures". In short: "Life exists to produce new life", which is a circular expression because, in the reason we search for life, the term "life" (for which we try to find a reason) is used.
I think there are more "friendly" interpretations of evolution, of which I have no doubt that it took place.You can interpret evolution for example from a less egoistic perspective, and say evolution takes place to give new organisms a chance to live. Ande, in the case of human beings, create memes to let other people enjoy them (and not just to let your memes live further in other human beings).
If we follow Dawkins's interpretation then the scientific meme is self-undermining because the way we use science is damaging the earth to such an extent that it's the question if the earth will face a long-term future.