Shadowy Man
Contributor
I think he is suggesting that if someone enters his home uninvited they have forfeited their right to life. Just like how those who threaten or disobey the police do.How do you know they even heard your "warning"?How they know? Ignoring a warning!You have failed to establish that "If they didn't intend harm they wouldn't be coming up there", and handwaving it isn't convincing at all.
You are also engaging in mind-reading (of a hypothetical person, no less) when you say "...knowing there was someone up there who didn't want them there".
How do they know? How do you know that they know?
It's all more than a bit tenuous as a motive for premeditated murder.
Have you never misheard or missed entirely something shouted at you from a different room or floor of the house?
Bear in mind, your plan is to deploy lethal force here. The standard required of you is rather higher than when you are just wanting your wife to bring you something from downstairs on her way up. The consequence of being unheard or misunderstood is pretty severe; You become a murderer, and someone else dies.
Being most probably right, isn't adequate, when the consequences of being wrong include death.
But maybe I’m misreading his posts.