I have a daughter, and like most dad's I'm protective of her. However if I walk into her room at night and a boy is in bed with her, but she says she doesn't know him, then I gotta question my daughter. She is the responsible party along with the over reactive dad.
I just don't see where the dad or daughter have a case at all.
Even if she tells the truth it doesn't mean he isn't a threat since the father doesn't know him either.