“Father discovers a stranger crouching in the bedroom of his daughter in the dark of night.- what would YOU do, invite him for a beer conference?”
Turn on the light and ask the daughter “Do you know this guy?”, while keeping my gun on the unknown person.
and gambling that the intruder crouching in the corner doesn’t have a weapon - and giving him time to use it.
Then when the guy comes at him - reasonable to assume he’s an intruder and has the right to protect himself and daughter.
the daughter and the guy created the situation - not the father.