Marshall I think that's a bit of a cop-out.

Why wouldn't a PM cheat? Why would it ever remain inside the frame of the game?

Would two so radically different agents even recognize the same pay-off frame?

"The different one" will have different pay-offs - and I will never know them and am unlikely to benefit fra any of them.

In my world a PM is chaotic, just as I am chaotic in his. Thus we are each other's enemy and must hide from the other.

No interaction because otherwise the number of crying mothers and car dealerships will always be higher.