You are incorrect. Deadly force may be used in a very broad sense, at least in sane jurisdictions. There is no way the intentions of another can be telepathically determined; all we can go off of is a persons actions and the context of these actions. Some unknown invader IN YOUR DWELLING, IN THE DEAD OF NIGHT, is well beyond any reasonable person’s boundary of being a treat.
Go back and read what I wrote again. I was specifically addressing self-defense, not any situation in which force can be used. The claim I responded to was your life doesn't have to be threatened to *defend yourself with deadly force*. There may be other situations in which force is authorized, but if the claim is self-defense then yes, your life does have to be threatened.