So, I just got into absurdism (formally-as a "branch" in philosophy, though I had been thinking in similar terms for a longer period now), and currently am reading "The Myth of Sysiphus" by Albert Camus. Also, I am looking into nihilism and existentialism.
Now, it seems to me (or I had not grasped it yet) that philosophers that write about such topics do not elaborate clearly on the question why is there no intrinsic meaning; they just seem to take it as a presumption. I'm interested in learning how did people like Camus arrive at that conclusion. How does one back-up the claim that there is no intrinsic meaning to life? Thanks