Psychologist Lawrence Kohlberg had the same questions, leading him to develop a theory of moral development that focuses on how children develop morality and ethical reasoning. This theory ...

Kohlberg, Elon, and John W. Pratt. "The Contraction Mapping Approach to the Perron-Frobenius Theory: Why Hilbert's Metric?" Mathematics of Operations Research, no. 7 (1982): 198–210.