All men have an equal claim to self-defense. Aggression is special pleading. Aggression is a contradiction to the evidence that all men have equal claims. It is not logically possible to have equal claims when one is an aggressor and one is a victim. The aggressor must necessarily assert a superior claim of authority over the individual of the victim.
I don't need a God to recognize the asymmetry of aggression. And it is not exactly rocket science either. Most individuals in both the animal and human world recognize when they are under attack and that self-defense is called for. No one has to consult the Bible to know that if someone is trying to harm them that they can repulse the force with the best of their ability.