What, if anything, makes an all-good god less absurd than an all-evil one?

For centuries, many Western theologians and philosophers have answered the ‘problem of evil’ – how a benevolent god could allow for pain and suffering – with the argument that, in order for humans to perform good deeds, they must be free to choose between good and evil. In this animation from the Centre for Inquiry UK, the British philosopher Stephen Law considers the inverse scenario: if there were a fully evil, omnipotent god, could we possibly imagine he would allow for good deeds to be performed in the name of freedom to choose evil?