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I didn't said it will never be necessary, what I said is that it will almost never be necessary. There will always be the case of lunatic agressor, but in a well civilized world the probability of encounter with such person will be very low. Every other conflict you might have will just have to be resolved in a civilized way. Sometimes by just walking away, there is no need to confront people for no reason.

I don't disagree, thanks for elaborating.

Well maybe in many thousands of years, after humanity maturizes and becomes more knowledge oriented and less instinct oriented.

But in our lifetimes the best we can do is to achieve a voluntary society where the use of defensive force can be used.