No the Vatican is not telling you that you are obliged to own a gun, it is saying it is your duty to defend your life and the lives of your family in the most appropriate way possible. It stated that small arms are often the appropriate tool to use.
You also seem very confused on the concept of martyrdom. To be a martyr you would die in the name of the Lord, defending him and his honor and the religion. To be beaten to death in your home, shot in a car jacking, etc, is not the road to martyrdom.
Further you completely omit the concept of the obligation to defend your own life, which is an obligation according to the Church.
You may choose not to own a gun, and I will support your right to not own one. However you do not know the situations and needs of others, where they live, what circumstances they face. To force them to live under your misunderstandings is not appropriate or ethical.