שמעון ולוי: צדק או נקמה?

The Sages taught in a baraita: The descendants of Noah, i.e., all of humanity, were commanded to observe seven mitzvot: The mitzva of establishing courts of judgment; and the prohibition against blessing, i.e., cursing, the name of God; and the prohibition of idol worship; and the prohibition against forbidden sexual relations; and the prohibition of bloodshed; and the prohibition of robbery; and the prohibition against eating a limb from a living animal.

Said Rabbi Nahman Bar Yitzchak: Their warning is their death. Rabbi Huna and Rabbi Yehuda and all the students of Rav said: Because of seven mitzvot a Child of Noah is executed.

14- And how are they commanded about the "laws"? They must establish judges and legislators in every town and town to legislate and judge on these six mitzvot. And warn the people. And a Child of Noah that breaks one of these seven mitzvot will be killed by sword. And because of this, all the people of Shechem were worthy of death. Shechem stole and they saw and knew and didn't judge him. And a Child of Noah is killed on the testimony of one witness, and one judge, without warning and even family members can testify.

And the Children of Yaakov were not honest with Shechem and Hamor his father: And how did the righteous Children of Yaakov do this heinous act of spilling innocent blood? And the Rabbi (Maimonides) answered in the Book of Judges (our last source, Ramban quotes it entirely). And these things are not correct in my eyes, that if they were then Yaakov our Father should have been the first to have the merit of executing them, and if he was afraid from them then why did he got angry with his children and cursed their anger after some time and punished them and scattered them. Didn't they have the merit of doing a mitzvah and trusted G-d and He saved them? And in my opinion, the "laws" that were given to the Children of Noah in their seven laws were not only to establish judges in every town and town, but were commanded as well with the laws of thievery and fraud (...) and so on, as the laws that the Children of Israel were commanded, and they are executed if they steal or commit fraud (...) and so on. And this mitzvah of establishing judges in every town and town as Israel, if they don't do it they are not execute, that this is a positive commandment and they said (in the Talmud) only that they warning is their death and warning is only regarding a prohibition.