Is suicide immoral?

This is a question with a long and disputed history. My own article in the Stanford Encyclopedia of Philosophy outlines some of the main moral arguments surrounding the permissibility of suicide: https://plato.stanford.edu/entries/suicide/

There's a long of history of religious anti-suicide arguments. I don't find these convincing as moral arguments, even granting the theistic assumptions on which they rest. And while I find Kant's position that suicide violates duties to oneself plausible, let's set that aside and treat your question as equivalent to 'does suicide wrong others?', I think the fairest answer is 'it depends.' The most credible argument for the immorality of suicide is that it harms specific others -- family members, etc. — who are are harmed psychologically or materially (a child whose parent's death via suicide deprives her of her parent, for instance) and who have come to rely upon the suicidal person in various ways. As I lay out this role-based obligations argument in the SEP article:

No doubt the suicide of a family member or loved one produces a number of harmful psychological and economic effects. In addition to the usual grief, suicide “survivors” confront a complex array of feelings. ... . Suicide can also cause clear economic or material harm, as when the suicidal person leaves behind dependents unable to support themselves financially. Suicide can therefore be understood as a violation of the distinctive “role obligations” applicable to spouses, parents, caretakers, and loved ones. However, even if suicide is harmful to family members or loved ones, this does not support an absolute prohibition on suicide, since some suicides will not leave survivors, and among those that do, the extent of these harms is likely to differ such that the stronger these relationships are, the more harmful suicide is and the more likely it is to be morally wrong. Besides, from a utilitarian perspective, these harms would have to be weighed against the harms done to the would-be suicide by continuing to live a difficult or painful life. At most, the argument that suicide is a harm to family and to loved ones establishes that it is sometimes wrong.

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