Please understand that the anger such treatment (validly) brings about is incredibly hard to suppress.
In that situation it's really hard to walk the line between expressing your emotions in such a way that it evokes similar emotions in others and not expressing so much anger that you will be classified as just bitter and vindictive.
And also, why should it be suppressed? Integration doesn't work if both parties pretend to be nice but are prepared to find a more underhanded way to stab each other in the back once the negotiations have ended.
I suspect we're both right for different reasons under different circumstances, and it would be fascinating to actually go through the histories and anthropologies to understand what those reasons and circumstances might be.