This is exactly what the teacher (that we've seen in the video documentary this Tuesday afternoon) wanted to show, in order to make children and even adults to not do to the other what they would not do to themselves.
It was really interesting to observe the difference between children and adults. It was more acceptable, to me, that children take time to understand the discrimination situation, but it is not so simple to understand the lack of expression or rather the lack of defense of the discriminated "blue eyes" group. Why do they not react? The hopeless ... it is exactly like a Greek tragedy, when your destiny (actually built by humans) takes totally possession of your life.
If people act like that in a school could you imagine how it is in the real life...