In this Haaretz article you can learn that Israel had safer homemade cluster bombs that would not run the risk of remaining unexploded, thus saving lives of civilians who would run upon them after the conflict ends. Yet it used the cheaper version supplied by the USA. Why? Simple:
Israel uses military aid funds to purchase cluster bombs from the U.S., and in order to buy IMI-made bombs, the Israel Defense Forces would have to dip into its own budget.
So no need to sue them on this issue they where not really trying to hit all these civilian victims but only to make a few well earned economies in a time of budgetary restrictions.
This is a new version of israeli’s “right to kill” after the Beit Hanoun “mistake” that made the object of a 4th US veto at the UN’s attempt to ease violence in the Middle-East. No wonder Hamas is trying to heavily arm itself if no one on the planet can ever concretely interceed in their favor.