Teen shot dead and another injured after suspected home invasion in Detroit

[IronGate]

15. Then show us the law that says it matters if an intruder is armed or not.

Bet you can't.

http://en.wikipedia.org/wiki/Castle_Doctrine

A castle doctrine (also known as a castle law or a defense of habitation law) is a legal doctrine that designates a person's abode (or, in some states, any legally-occupied place [e.g., a vehicle or workplace]) as a place in which that person has certain protections and immunities permitting him or her, in certain circumstances, to use force (up to and including deadly force) to defend themselves against an intruder, free from legal responsibility/prosecution for the consequences of the force used.[1] Typically deadly force is considered justified, and a defense of justifiable homicide applicable, in cases "when the actor reasonably fears imminent peril of death or serious bodily harm to him or herself or another".[1] The doctrine is not a defined law that can be invoked, but a set of principles which is incorporated in some form in the law of many states.