The tragedy of the commons To summarise on game theory. The whole discipline is based on maximizing, yes, maximizing negative externalities iff utility maximization can take place. Hallmark traits of ethics being love, compassion, and doing things for the greater good are devoid in it's logic.
It's the bastard child of Skinnerian behaviorism in my view.
Doubtless some great economist will come along and reify self interest to be inclusive of cooperative behavior, which is an ongoing task in the field today. But fundamental changes would have to take place in the field before that ever happens.