If you think suicide is irrational, consider this hypothetical. Let's assume you could aquire 10^5 additional average (not superhappy, just average) human life-years for yourself, but as a cost, you have to agree to be personally tortured severely (all with probability 1).
Would you take the offer?
This is relevant for anyone who claims suicide is irrational, while the decision of staying alive is not. I'd argue that, for any one person on the planet, the probability increase per year of continued survival for severe torture-like suffering, is higher than 10^-5.
So if you wouldn't accept the above offer, you shouldn't accept the conclusion that suicide is irrational, either.
(If you disagree with the probabilities, just adjust them in your mind. I assumed the statistical murder rate as a very crude proxy, which is actually higher than 10^-5 per person per year in the US and Europe.)
Are you still convinced suicide is always irrational? What would you say to a person who insists on rejecting the above offer and wants to aquire a good suicide method based on this argument? "You are objectively wrong about your preference not to be tortured"?
The length of time that the torture lasts is undeterminable by you until the torture is over, every second is agony, and you can tap out at any time and choose to lose out on those happy-years. That's the offer on the table for your suicidal person. It's an easy thing to say you would take this offer, but I'm pretty skeptical that the average person would actually be able to make it.
I was saddened to learn of the recent death by suicide of Chris Capel, known here as pdf23ds. I didn't know him personally, but I was an occasional reader of his blog. In retrospect, I regret not having ever gotten into contact with him. Obviously, I don't know that I could have prevented his death, but, as one with mental-health issues myself, at least I could have made a friend, and been one to him. Now I feel a sense of disappointment that I'll never get that chance.
Having said that, I must say that I take his arguments here very seriously. I do not consider it to be automatic that every suicide is the "wrong" decision. We can all imagine circumstances under which we would prefer to die than live; and given this, we should also be able to imagine that these kinds of circumstances may vary for different people. And if one is already accepting of euthanasia for incurable physical suffering, it should not be that much of a leap to accept it for incurable psychological suffering as well.
Of course, as Chris acknowledges, this doesn't imply that everyone who is contemplating suicide is actually being rational. People may for instance be severely mistaken about their prospects for improvement, especially while in the midst of acute crisis.(Conceivably, that could even have been his own situation.) Nonetheless, I think many of the usual arguments that people use to show that suicide is "wrong" are bad arguments. For example, consider what is probably the most common argument: that committing suicide will inflict pain upon friends and family. It frankly strikes me as absurd (and grotesquely unempathetic) to suppose that someone for whom life is so painful that they would rather die somehow has an obligation to continue enduring it just in order to spare other people the emotion of grief (which they are inevitably going to have to confront at some point anyway, at least until we conquer all death).
Ironically, society's demonization of suicide and suicidal people has negative consequences even from the standpoint of preventing suicide itself, as Chris points out:
It seems to me very possible that our society's fervor to prevent suicide may result in denying severely depressed people the compassion they need. This could theoretically be worth it if it prevented enough suicides that turned out to be worth preventing, but cases like Chris's raise doubt about this, in my mind. (From both angles: if Chris's decision was the right one for him, then the system is saving people it shouldn't be saving; if on the other hand it was the wrong decision, then we clearly see how the system failed him.)
Although I'm inclined to be sympathetic to Chris's view -- perhaps because I haven't always been maximally enthusiastic about my own existence myself -- there are some arguments that do worry me. Such as: if you think of future versions of yourself as separate agents, then suicide is a form of homicide. However, usually suicide is carried out on the belief that the future selves would approve of their nonexistence; and all of our decisions have consequences (often irreversible) for our future selves, so this is a general ethical problem that transcends the specific issue of suicide.
This post is a place to rationally discuss the ethics and rationality of suicide, as well as our attitudes (on an individual level, and as reflected in our institutions) toward suicidal people and, more generally, those suffering from psychological conditions such as depression.
I'm sad that Chris won't be able to participate.