A professor of philosophy writes in the NYT:
Unless we believe there is such a profound moral gap between the status of human and nonhuman animals, whatever reasonable answer we come up with will be well surpassed by the harm and suffering we inflict upon animals. There is just too much torment wreaked upon too many animals and too certain a prospect that this is going to continue and probably increase; it would overwhelm anything we might place on the other side of the ledger. Moreover, those among us who believe that there is such a gap should perhaps become more familiar with the richness of lives of many of our conscious fellow creatures. Our own science is revealing that richness to us, ironically giving us a reason to eliminate it along with our own continued existence.
One might ask here whether, given this view, it would also be a good thing for those of us who are currently here to end our lives in order to prevent further animal suffering. Although I do not have a final answer to this question, we should recognize that the case of future humans is very different from the case of currently existing humans. To demand of currently existing humans that they should end their lives would introduce significant suffering among those who have much to lose by dying. In contrast, preventing future humans from existing does not introduce such suffering, since those human beings will not exist and therefore not have lives to sacrifice.
So he doesn’t advocate the killing of all currently alive human beings but he does think there is a case for killing off future humanity.
Only in academia!