r/AskPhilosophy construed the following quotation from Le Mythe de Sysyphe: Chapitre 1, which Alan Watts joked about. Emboldenings are mine.
Il n'y a qu'un problème philosophique vraiment sérieux : c'est le suicide. Juger que la vie vaut ou ne vaut pas la peine d'être vécue, c'est répondre à la question fondamentale de la philosophie. Le reste, si le monde a trois dimensions, si l'esprit a neuf ou douze catégories, vient ensuite. Ce sont des jeux ; il faut d'abord répondre. Et s'il est vrai, comme le veut Nietzsche, qu'un philosophe, pour être estimable, doive prêcher d'exemple, on saisit l'importance de cette réponse puisqu'elle va précéder le geste définitif. Ce sont là des évidences sensibles au cœur, mais qu'il faut approfondir pour les rendre claires à l'esprit.
There is only one truly serious philosophical problem: suicide. To judge whether life is or is not worth living amounts to answering the fundamental question of philosophy. The rest—whether the world has three dimensions, whether the mind has nine or twelve cate- gories—comes afterwards. These are games; one must answer first. And, if it is true, as Nietzsche claims, that a philosopher should preach by example in order to command respect, one begins to un- derstand the importance of that reply, for it will precede the defini- tive act. These are truths the heart can feel, yet they must be exam- ined in depth to become clear to the mind.
Can someone elaborate Conifold's comment? Which philosophers disagree with this quotation above? Why isn't suicide a "vraiment sérieux" (really serious) "problème philosophique" (philosophical problem), let alone "la question fondamentale de la philosophie" (the fundamental problem of philosophy)? What did Camus muff?
Because few philosophers share Camus' opinion. To them, suicide is serious as a social and psychological problem, but not as a philosophical one. People who commit suicide almost never do it for philosophical reasons, it is typically an emotional act, perhaps fueled by social circumstances, so its scientific study is more productive. Philosophically, it comes up mostly due to ethical aspects.