An illustration may help a parent to see how illogical it would be for God to have the Devil torment people in hellfire.
فَيُجِيبُ ٱلْوَالِدُ عَلَى ٱلْأَرْجَحِ أَنَّهُ سَيُعِيدُهُ إِلَى ٱلطَّرِيقِ ٱلصَّوَابِ .‏