Catechism of the Catholic Church (yes, Virginia, even Papists get it right sometimes! - ;0) MH), the requirement of proportionality in just war theory is that “the use of arms must not produce evils and disorders graver than the evil to be eliminated. By any reckoning, the current operation in Gaza has already done this, and the harm will be compounded if the Israeli government decides to launch a ground invasion. The fact that it is not yet as disproportionate as Operation Cast Lead or the second Lebanon war doesn’t make it all right."
It's a plea more than an analysis, but read it all here and pray for a speedy and just resolution to the present conflict that will end the slaughter of the innocents on both sides and pave the way for lasting peace and co-existence.