Aside from the difficulty of conjuring up a more illogical ad hominem style of argument that ignores the tremendous contributions of the childless committed to helping build a better world, on a more positive note, if only parenthood did reliably confer empathy for one’s fellow humans, we would all have better mental health, greater conscience development, and higher intelligence. :)
I teach other people’s kids, and have none, and would myself be proof that Ferguson is wrong. But my experiences indicate he would be right more than wrong.