I see others have kind of filled in the blank spots I left in my reply.
I'll rephrase your question into my own words: "Are you saying he should be shot dead simply because he's in my house, uninvited, in the middle of the night, and apparently in a drug induced haze?" YES!!! We'll figure out the rest after the funeral.
The homeowner doesn't have an obligation to kill him, but as a general rule he would be doing society a favor by pulling the trigger. If I had the money, I would establish some sort of award for those howmowners who kill intruders, thereby making the rest of us safer.
Not to mention that if the homeowner only wounds the perp. he's guaranteed to be put through YEARS of lawsuits by the perp., now the "victim", because he was shot.
It's much easier if the cops only have one side of the story when they write up their report.
Two to the chest, one to the head. (And packing +P hollow points might be a good idea too.)