If you really mean that, I hope you are not married and have no children or roommates. If you do, and they invite someone in, and you shoot them as an intruder, we will be reading about you here on Free Republic...
In the highly unlikely event that my wife or any of my children invite undesirables into my home my response won't necessarily be violent.
But I do not buy for one instant the legal theory that a homeowner has no ability to decide who is or isn't allowed into his home.