בְּנֵ֣י יַעֲקֹ֗ב בָּ֚אוּ עַל־הַ֣חֲלָלִ֔ים וַיָּבֹ֖זּוּ הָעִ֑יר אֲשֶׁ֥ר טִמְּא֖וּ אֲחוֹתָֽם׃
Сыновья Иакова пришли на убитых и испортили город, потому что они осквернили свою сестру.
Radak
בני יעקב באו על החללים, to undress them and to take all their possessions
Sforno
העיר אשר טמאו, unless according to the mores of Shechem (city) such behaviour was no longer considered despicable, Schechem would not have done what he did. He felt sure he could get away with it, as his townspeople would not object. However raping virgins was commonplace in Shechem already. They behaved in the manner described in Genesis 6,2 “they took women for themselves from wherever they chose.” [the punishment for this type of violence had been the deluge. Ed.]