Kristianikos,
It is all about claiming the outdoors, the common space outside our houses, and the confidence that if you ask for help then someone WILL help you, not concerned about becoming the accused because he helped you, like it happened with Bill above.
Notice how fields and orchards in Mediterranean countries are not fenced. This too is part of claiming the outdoors, and sharing a common code of conduct and respect for property. It all ties in with how we behave.
It is also related to a taboo we have built in most Mediterranean cultures, the taboo prohibiting harming someone for no reason, which in turn makes the weapon issue redundant. In some cultures such harm is not only not taboo, it is seen as an accepatble part of that process called "having a laugh".