If we own our lives, we must also own our actions and thus our labor must be owned by us as well. Work is an exchange. One for that of life for property. If you steal from someone else, you are taking part of their life. This can not be legitimate if we own ourselves.

Aggression, as i define it, is coercion through fear, force, or falsity. None of these is legitimate if we own ourselves.

Who owns you? The common reply would be "no one owns me!", but if no one owns you then how can you possibly have legitimate control of or responsibility for your actions? The answer is that we own ourselves and thus own our actions and no one has a right to relieve us of that.