All gratuitous suffering is evil, but not all evil involves suffering. The wanton destruction of an anaesthetized healthy but ownerless cat or dog is evil but causes no suffering.
Footnotes to Plato from the foothills of the Superstition Mountains
All gratuitous suffering is evil, but not all evil involves suffering. The wanton destruction of an anaesthetized healthy but ownerless cat or dog is evil but causes no suffering.