At its most radical, the animal rights agenda seeks to give animals rights not only equal to, but greater than the rights of humans. Many animal rights extremists hate humans and support the concept of a "no birth nation". The radical animal rights agenda supports mandatory sterilization of all pets, until there are none; seeks to outlaw science-based animal care practices in favor of emotion-based systems that are often less advantageous for the animals; promotes a vegan diet, often by introducing laws that make non-vegan foods prohibitively expensive; and opposes no-kill shelters, believing instead that it is kinder to kill an animal than to subject it to a life of enslavement and exploitation as a pet.