A man can gasp out his life beside you-and you feel none of it. Pity, Sympathy, sure-but you don't feel the pain. Your belly is whole and that's what counts. A half-yard away someone's world is snuffled out in roaring agony-and you feel nothing. That's the misery of the world.
Fiction inhabits the zone between the real and the impossible. The tug of those two poles is what gives it motion, vitality. Tethering fiction too tightly to the real produces plodding, lifeless stories. Letting it float too far from that anchor produces stories that are arbitrary and unpersuasive.