Yeah, I don't think mass executing partygoers at a music festival has anything to do with "the standard rules of war."
Israel's response was obviously disproportionate but certainly fell within the standard conventions of warfare (e.g. executing enemy commanders being housed/protected by the populace is fairly standard.)
Hamas is an indirect creation of Israel, they wouldn't exist if not for decade of violence and humiliation from Israel. In the same vein, the Likoud exist because of the PFLP and maintain its power thanks to the presence of Hamas. Both the extreme right in Israel and the Islamist movements in Palestine feed themselves and survive thanks to hatred and have no reason nor any wish to make this conflict stop. Netanyahu and his minions were probably laughing at the sights of the victims of october 7 knowing this would only help them.enforce their politics.