Mr. Cosgrave is correct. If Israel follows through with the proposed invasion or incursion or whatever it calls the plan to assault Gaza, then they are putting civilians in harm's way big time and need to be held accountable for the carnage. For that crime. Hamas isn't going to stick around in the north end of Gaza waiting for Israel to attack, they're going to hide among civilians as they always do.   

Hamas is a terrorist organization and what they did was a terrorist act—their slaughter of Israeli civilians and the taking of hostages are war crimes they need to be held responsible for. That kind of act is never one that will promote cooperation or establish a Palestinian state.