In other words, it's better if those persons are never born. Brock has advocated aborting persons with disabilities in the past. In fact, Brock has advocated governmental pressure on parents of disabled babies to kill them for a period of up to several weeks after birth.
Has Brock also?
Because what Brock says here is sick and evil enough - if he's also advocating Singer's position, then the moral cancer is metastasizing.