This problem would be avoided if everybody took their own lives at roughly the same time, but that is not going to happen.He is referring to the fact that saying that life is bad does not mean we should all commit suicide, because (in part) the resulting grief in those who survive would make their lives even worse. (It's my inability to take such thoughts seriously that prevents me from reading the whole thing.)
Another eye-catcher is his claim that there is no such thing as chronic pleasure. The comments by Nick Smyth and Jennie Kermode ("No such thing as chronic pleasure? Have you never been in love?") are worth reading.