Thank you for the feedback. Yes you are correct about ethics, that is to govern our moral behavior on what we think "ought" to be right and wrong.

If you think about your example, that is the kill or be killed mentality and there is nothing wrong with that, ultimately that is part of our survival instincts but were we built with killer instincts? The thought of harming others should not be entering anyone's mind at all but that is not the case in this world.

Just because you can think it, doesn't mean you should think it.

We have the answers to most of our questions within us. If an individual had the correct knowledge and understanding of morality, and ethics, one would not need to harm anyone at all or worry about being harmed.