It Wasn't Pretty
There is no post-apocalyptic story to tell, the human race has been classified as EXTINCT.
Why hadn't the cerebrum thwarted such a travesty? We knew why. The answer to the decimation of the species lies between the Homo sapiens brain and the heart. More precisely, the reason for the races extinction could be found in the misapplication of these vital human organs. There were those on the interplanetary Council who had argued that the end had become inevitable when the species began behaving in a manner that could no longer be categorized as 'human'. As she listened, she recalled how that she had once startled her mother when she had spoken aloud that, we humans are animals too. She was grateful that her mom had moved out of body before the end came.