It only "prove[s] part of the argument" if you rephrase the argument to your liking. You are also conflating "defensive" and "aggressive." Kinda like saying Switzerland is "aggressive" because they have mandatory military service for all males.
I'm curious: Have you heard of the state's "monopoly on violence" before? It comes up a lot in political theory discussions, and it applies to this attempted rebuttal by analogy.