"The harm inflicted by the suicide upon himself must be the deprivation of possible future experiences (keep in mind that sacred harms, such as religious harm, belong under different moral foundations). However, by committing suicide, a person affirms that, in his evaluation, the expected future gains from living are not worth the expected costs. Many people intuitively support this line of thinking when it comes to people dying of a terminal illness. But why would people dying of a terminal illness be the only people miserable enough to rationally want to die? Hope is not necessarily rational. Prohibiting suicide amounts to substituting one’s own (poorly informed) judgment for the suicide’s own (immeasurably better informed) judgment of the degree to which his life is worth living."
January 1, 1970
https://en.wikiquote.org/wiki/Right_to_die