And by the same token, there's no reason you couldn't construct a system where everybody helps everybody else defend their property simply in terms of "mutual a

And by the same token, there's no reason you couldn't construct a system where everybody helps everybody else defend their property simply in terms of "mutual aid". Just such a system existed in the English common law, and from what I've read in the early days of America: https://en.wikipedia.org/wiki/Hue_and_cry https://en.wikipedia.org/wiki/Hue_and_cry