Death

In plain terms

Two questions about death look simple and are not.

The first is when it happens. For most of history the answer was obvious: breathing and the heart stop. Ventilators made that answer inadequate, because a body can be kept going after the brain has ceased entirely - so a new criterion had to be written, and writing it was a decision rather than a discovery.

The second is whether it is bad for the person who dies. Epicurus argued not: harm requires a subject, and after death there is nobody there to be harmed, so fearing it is fearing nothing. The obvious reply is that death deprives you of what you would have had - which requires explaining who is deprived, given that they do not exist.

Neither question has an agreed answer, and both are decided daily in hospitals.

As a philosopher would put it

The definitional question was reopened by intensive care. The 1968 Harvard committee proposed irreversible coma as a criterion, and the 1981 Uniform Determination of Death Act in the United States set two alternative standards: irreversible cessation of circulatory and respiratory functions, or of all functions of the entire brain. Most jurisdictions followed. Critics, including the philosopher-clinicians who pressed the point through the 2000s, argue that whole-brain-dead bodies retain integrated functions, so the criterion is a convention rather than a biological fact - a conclusion the President's Council on Bioethics engaged with directly in 2008.

The evaluative question is the deprivation debate. Nagel's argument is that death is bad because it deprives one of goods one would otherwise have had; the Epicurean objections are the timing problem - when is the harm suffered - and the symmetry problem, which Lucretius raised: we do not regret the eternity before our birth, so why the one after.

What is actually disputed

Whether death harms the one who dies.

The deprivation account is the majority view and owes an answer to the timing problem: if the subject does not exist after death, when is the harm sustained? Answers include that it is timeless, that it is sustained at the time of death, or that harms need not be located.

Epicureans hold that this shows the harm is not real, and that fear of death is a confusion which philosophy can remove.

Lucretius's symmetry argument is the sharpest form and has no consensus answer. Parfit's response - that we are biased toward the future in a way that may itself be unjustified - accepts the asymmetry as a fact about us rather than about the world.

Underneath sits the definitional dispute, which matters practically: if whole-brain death is a convention rather than a biological boundary, then transplantation practice rests on an agreement rather than a discovery.