When meeting that enemy, be proportionate
Many years ago the Western cities of Virginia had good reason to fear an attack from West Virginia. The American Civil War had some ugly chapters where seige warfare became 'modernized' and that should be interpreted as shelling the cities [as was done along the Mississippi] into submission. No reasonable historian would fault the defenders of Vicksburg, Memphis, or the brave men who built Fort Johnson on the Western border of Augusta County to protect the towns of the Valley of Virginia.
If we could but remember the threat of close destruction, we would not fault the defenders of Sderot either. In fact, we would likely agree with Jonathan Mark's Observation that Israel's Response is Disproportionate. Put yourself in their shoes and you will see the problem in a different light.
A child's drawing from Sderot shows
the horror of war.