Not all harms aggregate, and in particular lots of nano-pains experienced by lots of sufferers aren’t ontologically equivalent to a single agony experienced by a single subject. Utilitarianism isn’t an objective fact about how the world works. There’s an element of make-believe in treating all harms as aggregating. You can treat things that way if your intuitions tell you to, but the world doesn’t force you to.
Not all harms aggregate, and in particular lots of nano-pains experienced by lots of sufferers aren’t ontologically equivalent to a single agony experienced by a single subject. Utilitarianism isn’t an objective fact about how the world works. There’s an element of make-believe in treating all harms as aggregating. You can treat things that way if your intuitions tell you to, but the world doesn’t force you to.