That is a serious question posed by atheistic "philosopher" Pete Singer of Princeton University. He is apparently mulling over the work of fellow atheist David Benatar. Both men (in differing degrees) opine that the pain of human existence is evil.
In my opnion, if one holds to the erroneous belief that there is no God and that there is no eternity, then the beliefs of these two men are actually quite logical and consistent. Did not even Paul attest to that logic in 1 Corinthians 15, when he states that if there is no resurrection, then "eat, drink and be merry for tomorrow we die"?
Those of us who grapple with the Culture of Death (e.g., those of us in front of abortuaries) would do well to consider this mental paradigm that is foundational to the thinking of our opponents. While they still have that God-shaped restlessness in their hearts (of which St Augustine wrote), they are becoming increasingly oblivious to it and unable to recognize it.