If there are unknown rightmaking properties that could justify allowing evil, there are equally likely to be unknown wrongmaking properties of equal weight that would make allowing evil even worse.

To establish that the inductive step in the version of the evidential argument from evil set out above is sound requires a rather technical argument in inductive logic. But one can gain an intuitive understanding of the underlying idea in the following way. Suppose that there is a rightmaking property of which we have no knowledge. If an action of allowing a child to be brutally killed possessed that property, then it might not be wrong to allow that action, depending upon the weightiness of that unknown rightmaking property. But the existence of unknown rightmaking properties is no more li...