Moral stages

Piaget's theory of moral judgment is a two-stage approach, expanded upon by Lawrence Kohlverg to a 6 (or 5) stage approach.

Here is some references:

KOHLBERG'S STAGES OF MORAL DEVELOPMENT, from
W.C. Crain. (1985). Theories of Development. Prentice-Hall. pp. 118-136.

An Overview of Moral Development and Moral Education
A summary of Piaget's Theory; Kohlberg's Theory of Moral Development and Education; Domain Theory: Distinguishing Morality and Convention; Carol Gilligan and the Morality of Care

Studies in Social and Moral Development and Education: Featured Articles

As for my central proposition, I think the best approach is to flip my current argument from:
Video games > meaningful > what is meaning >create meaning > prosocial

To:
Current social trends > need to support morals > During development of morals > active learning > video games (as natural conclusion :D )

It fits nicely I do believe, which allows me to research more on active learning in video games.