Of course, if he had just shot the boy and called the police, he'd be free and no one would bother his house for a good long time.
But I think he got a chance to do what he most wanted to do: murder a helpless girl with his face close to hers while cursing at her, and then spend a night with her body in his house.
If only all housebreakers could meet the same fate.
Soon there would be no more housebreakers.