"If I'm writing by intuition, generally that calculation works itself out. But if I'm writing a mystery, and somebody has to have a reason for doing what he's doing, and it's not anything I can imagine myself wanting to do, things get a little more difficult to write, and careless mistakes are made."

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According to classical utilitarianism, the only intrinsic good is happiness; the only intrinsic bad is pain. That implies no intrinsic value in preserving nature, that preserving an endangered plant is valuable only if it benefits humans or other animals. Intuitively, that seems wrong but perhaps I shouldn't trust my intuition here.

— Peter Singer