Matthew Poole and continuators on Genesis 34:27

27 The sons of Jacob came upon the slain, and spoiled the city, because they had defiled their sister.

(i. e.) One of them, as oft-times that which is done by one man is imputed to the whole body. See Ios. 7. 1, 11, 12. and 22. 20. Mat. 2. 20. Or they impute Shechems fact to all either invidiously and cunningly to take off from themselves the reproach of this cruel action; or because they made themselves guilty of it either by not discouraging and hindring that filthiness, as far as they might; or by their being instrumental in it; or by their approbation of it, and complacency in it.