I beg to differ with you. The Castle doctrine also known as
Defense of Habitation Law designates one's place of residence and in some states car or workplace. It only gives a person the legal right to use deadly force to defend that place, his/her "castle."
In criminal law, the castle doctrine is an exception to the retreat rule. The retreat rule allows a person the use of deadly force while protecting his/her place of abode, its premises and its inhabitants from attack such as from a trespasser who intends to commit a felony or inflict serious bodily injury or harm. This defense justifies such conduct constituting a criminal offense. This is also termed as defense of premises, defense of habitation and dwelling defense.
http://definitions.uslegal.com/c/castle-doctrine/