Hamas really killed themselves with their murders, Israels response will be brutal and long. But they will not kill “everyone” as you say, they are bombing Hamas targets and many of them are located in civilian spots. It will not stop Israel after these terror attacks and everyone knew this beforehand. Israels actions before have been exactly the same.
Hopefully Hamas will be completely eradicated and the Palestinians will reject these fascist leaders from now on, for betraying their trust and leading their people to even more suffering.