For example, there's a reference to Superman breaking a wife-beater's ribs and hips by throwing him out a window, e.g. very severe, long-term debilitating injuries, which is a bit of a bridge too far into vengeance, punishment-for-punishment's sake, which has never been what Superman has been about... at least, for me.
I'm not so sure... Wife-beaters are probably example #1 of criminals whom our justice system are not effective at handling. The women are too scared to come forward or can't be adequately protected when they do come forward. A long-term debilitating beating might actually be a good life-lesson for such sickos and actually give the battered wife a chance to restart her life elsewhere.