A redated post.
How would the discussion begin in response to a position like this? This is body autonomy with a vengeance. For this guy, the principle of body autonomy trumps the right to life.
1. I'm entitled to kill anything, and anyone, which is located inside my body, no matter what or who it is. If all the people in the whole world--innocent and guilty, unborn and already-born, great and small, rich and poor, smart and stupid--were assembled somewhere inside my body, along with Baby Jesus, Almighty God, and The Flying Spaghetti Monster, then I'd be entitled to holocaust 'em at will. That's part of the meaning of the word "my" in the phrase "my body".
2. If something or someone is living by means of my body's life-support functions, on food I eat and digest and on air I breathe, I'm entitled to stop that anytime. The life-support machine is part of my body, so it's mine to switch off.
3. If someone is getting ready to subject me to major medical/surgical trauma, I'm entitled to prevent that by killing the someone. You know, just as a man would be. Even if they're doing so unintentionally. It's not punishment; it's protection.