Re your post 19, funny but just as soon as I posted my original item, I thought of Texas and figured that this "rule" wouldn't apply there. Note that I did say "almost all jurisdictions."
Have you ever wondered why the rules in Texas haven't spread? I have. The rules are pretty simple; if you don't own it, don't take it. If it isn't you house, don't go in until invited.
In some areas I have lived, if you dropped in on a friend unannounced, and rang the bell and received no answer, one may open the door to the house and go in. That simply doesn't happen down here. Unless you are a family member, or CLOSE personal friend, you never enter a house unless invited in.
Why do the other states take the legal position that by default protects the criminal? Wouldn't the logical action be to protect the victim, investigate and if this were a set-up ("Hi, come in" ..... bang) move to press charges? I like it down here, I've lived in the Mid-west; the Pacific North-west, and Texas. I'm back down in Austin; and I ain't never leavin.