In the present case, the "military end" which Israel seeks is putting an end to the barrage of Qassam rockets. "Proportionality" DOES NOT mean, as some folks on this forum seem to think, that Israel is limited to launching the equivalent of Qassam rockets. Indeed, doing so would violate the principle of "Discrimination". Rather, "Proportionality" means that Israel must use force appropriate to destroying the Qassam rocket launch sites and the associated communications, command, control, and intelligence infrstructure. This is, in fact, what Israel appears to be doing. Nuking Gaza into oblivion, as some of the more bellicose on this forum suggest, would violate both Proportionality and Discrimination, and would be a hideous crime.
Good points.