Deutlich fundierter als Glucksmann und Dershowitz beleuchtet Michael Walzer die Verwendung und den völkerrechtlichen Hintergrund der Verhältnismäßigkeit:

Let’s talk about proportionality–or, more important, about its negative form. “Disproportionate” is the favorite critical term in current discussions of the morality of war. But most of the people who use it don’t know what it means in international law or in just war theory. Curiously, they don’t realize that it has been used far more often to justify than to criticize what we might think of as excessive violence. It is a dangerous idea.

Michael Walzer: On Proportionality.