The first person to ever be excommunicated was Cane. The story of Cane proves that Capital Punishment is not an absolute requirement.
Hagar and Ishmael were the next to be excommunicated. This proves that men are not responsible for the women of extra marital affairs. It also proves that men are not responsible for the children of extra marital affairs.
Jacob was excommunicated for stealing the Blessing. This proves that if you are willing to pay a high price it is ok to deceive others. And if you are smart the deception might be better than honesty.
Moses is the next. The story of Moses proves that the only real way to become an expert in the Law is to take the Law into your own hands.
Joseph we be next.
