Israel must use ONLY a proportionate amount of force. This means using no more force than that required to DECIMATE and DESTROY WILLPOWER TO FIGHT of Fatah, Hamas, Hezbollah, and if required, Syrian and Iranian military. NO more, and NO LESS.
I think overwhelming force is better. The US and its allies showed that that worked in Iraq twice. Word War I was the ultimate example of proportionate force. Neither side was able to overwhelm the other over a period of over four years. The roughly balanced strength of the opposing forces led to incredible amounts of carnage.