Well lets take a real world example. In March 1982, Kennesaw town passed a law making EVERY household have to own a gun. Since then (well OK definitely until 2007 as that is when the article is written) "not a single resident has been involved in a fatal shooting - as a victim, attacker or defender"
Go read - http://www.wnd.com/news/article.asp?ARTICLE_ID=55288