Ego:How about this: what if I throw something at you and it bounces off you and hits a glass window, breaking it? Should you have to pay for it?
No. Obviously something bouncing off of you is not an action and cannot be considered a crime.
Ego:In reality, the only person who should be punished is the one throwing the brick.
Vicitms of crimes should have the right to punish anyone who commits a crime against them, regardless of whether that person is a victim of another crime. People do not have the right to externalize their costs of defense onto innocent parties. Why should someone be let off the hook if their defence includes aggressing against an innocent party? Why should the innocent parties rights by circumscribed? After all, they have done nothing wrong. Why shouldn't they be allowed to punish both aggressors?
Ego:According to you, if you have "only negative obligations" in regards to ducking, why wouldn't the obligation be "don't duck, you know someone will get hurt"?
Because, I only look at the issue from a property rights perspective. A person only has the right to not have their property invaded. They do not have the right to not get "hurt" apart from their property titles.
When a person homesteads scarce standing room, they also homestead all unowned property necessary to make use of that property except what has already been homesteaded by someone else. If he feels threatened by someone who plans to throw a brick at him and stands behind a barrier that is unowned, he homesteads the barrier (temporarily at least). No one else has the right to remove that barrier. Now if that barrier happens to be another person's property, such as their body, it can not be homesteaded. The person can move freely about and dodge if they would like to.
See it all comes back to first principles.
Right to own body => Right to homestead
((Right to own body)AND(Right to homestead)) => NAP
NAP => (Right to duck)AND(NOT(Right to deflect))AND(NOT(Right to shoot through hostage))
NAP => (NOT(Right to cause collatoral damage))AND(NOT(Right to hit trolley switch)
NAP => Punishment theory
Punishment theory => (Right to self-defense)AND(Right to proportional restitution)AND(Right to proportional retribution)
So there's my case. What's yours? Why should resulting harm be considered the basis for rights instead of property?