Catholic law professor Stephen Bainbridge has more on just war and proportionality.

Prof. Bainbridge is making a slightly different point than the one I was trying to get at. He’s more concerned about how the targeting of civilian infrastructure violates the criterion of proportionality. I was assuming, for the sake of argument, a case where all the targets were legitimate military targets, but was trying to figure out how we determine the acceptable amount of “collateral damage.”