A good, but very 18th-century style, post/treatise: The Sickness of Life: On the Problems with Anti-Natalism
He spends a lot of words on the philosophy of it all. None of that matters. As I commented there:
This is as obviously not-really-believed as the Many Worlds interpretation of quantum mechanics.
If any of these people actually believed this, they’d kill themselves rather than write treatises about it (or after writing one). If anyone believed in Many Worlds, they’d commit quantum suicide (dead to one world-line observers, but themselves still living in the alternate world line).
Since neither of these things occur, the people spouting this do not actually believe it.
Note that believing that one’s own life will not get better and committing suicide is entirely different from believing that ALL life is not worth living.
While, as the article points out, “life sucks; not being born would have been better” is not at all a new sentiment (he quotes Sophocles), it’s philosophical masturbation unless the author has killed himself.
In more modern parlance: You first.
Marked Up 
Does anyone not know what “quantum suicide” is? It’s the Schrodinger’s Cat experiment with yourself as the cat. One of these days, I’m going to write that short story.
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