A coldly rationalist individualist can deny that he has any obligation to make sacrifices for the future.
A finite world can support only a finite population; therefore, population growth must eventually equal zero.
Ecological differentiation is the necessary condition for coexistence.
An attack on values is inevitably seen as an act of subversion.
The optimum population is, then, less than the maximum.
The social arrangements that produce responsibility are arrangements that create coercion, of some sort.