[Florin_Andrei]

> The reduction in politeness is also interesting.

It's very counter-intuitive. I'd like to hear a rationale for this strategy.

[JulianMorrison]

My guess is dehumanization. The betrayer has to shove down their empathy, and that blocks them from thinking of actions that flow from caring about another's feelings - except instrumentally. So direct feeling manipulation, "positive sentiment", goes up.

[ashark]

This may be measuring relative power or favorability of position for the two players. Weaker players are more polite to their stronger allies (and less likely to betray), strong players are less polite and more likely to betray, for example.