I agree, cutting off the water is too extreme. The bombing bit is debatable, Hamas deliberately surrounds themselves with civilians. They are responsible for those deaths more than the Israelis are. It's a bit like challenging another dude to a fight and then hiding behind your girlfriend or a child when he starts throwing punches at you.

Hamas aren't a group of isolated terrorists. They are the government of Gaza. The vast majority of people in Gaza support their actions. It's not as clear cut between civilians and the baddies.