Proportional response must take into consideration the capability of the agressor. If 95% of Hamas’ total capacity is being used to fire rockets at Israel, it can be reasoned that a similar proportion of force will be used when Hamas has more lethal means at its disposal. War is a defensive necessity in this case - the wolf will only get bigger, meaner, and hungrier.
The term “Proportional response” is BS. If a bully slaps you, are you just going to slap him back or are you going to take him out? “Proportional response” is used by politicians to drag out a conflict and nothing more. Would we use “Proportional response” if we were attacked by Mexico or Canada? I don’t think so. If you shoot at me with a .22, I will come back at you with the biggest weapon I own.....simple as that. We need to stop kidding ourselves.