the non aggression principle isnt exactly something you can break, its an idea, a standard some men hold themselves to, to not agrees.
if you agrees, then they can bring force without being the aggressor, you have opened yourself up to the wrath of good and just men is all
when you "break the nap" you are not breaking the nap itself but opening a floodgate created as a consequence of the nap, a floodgate their for your own safety.