The pervert was naked, so he was obviously sexually deviant - probably masturbating in the proximity of this man's daughter.
How are men and women supposed to keep their wits about them when confronted with imminent violent criminals? Was the father supposed to yell "boo" and hope to scare the freak away? What the hell is he supposed to do?
It's a simple equation:
My daughter + naked man masturbating outside her window – police + fatherly instinct = beatthesh*toutofthesicksonofabitchwithoutthinkingoftheconsequences
That should just be the law of the land, case closed. I can see an arrest and an investigation. But by all that is holy, once the facts are established, let the man get back to being an excellent father.