In many ancient cultures, women were objects of love and desire, as well as property. Rape could be paid for. And it seemed like Shechem could have his way with Dinah and keep her for a price. And Jacob, her father, held his peace until his sons had weighed in.
The fact that God did not want them intermarrying with idolators complicated this matter. Jacob was in a place where he should have told them why this rape could not be rectified on normal terms. Shechem and his whole tribe was unholy, and they could not just do a bride exchange and become one people. But this would have been awkward. And as a remedy, Shechem would probably have to be executed. But angrier heads prevailed as Jacob’s sons came up with a plot that would demonstrate the severity of what had happened for all time.
After the men of Schechem have all been circumcised, and are quite incapacitated, Levi and Simeon go in and slay all the men, and the rest of the brother’s plunder the city, even taking the women and children. Jacob is understandably disturbed at how this will make him look to all the other people groups who are their neighbors. But he did not act as the patriarch he was, and left it to the mob: his angry sons.
Getting Justice is about giving people what they deserve. Did all of Shechem’s tribe deserve this? No. The Justice got socialized. That is how you go about punishing a group for what an individual has done.
When you ad a modifier to the word “justice,” it changes it’s meaning. Social justice is not justice at all. It’s mob rule. And it appears to be profitable as well. The innocent got milked dry for reparations. This still happens today.