He hit a 13 year old girl in the face, and she rang the police. They had no way of knowing that this was an isolated incident, and as the Greater Manchester Police spokesperson said ""An allegation of domestic violence was made and GMP officers always take these allegations very seriously."
Quite rightly so. This man admitted the offence (for that's what it was), and to be honest, banging a neighbour's window at midnight hardly seems to be a justification for slapping your teenage daughter in the face.
Obviously the daughter didn't expect the consequences to be quite so serious for her father - no doubt she wanted to give him a scare - but he's the adult in this equation, and he's the one who should have been acting with a little self control. He lost it for a moment, and he's paying a price. I find it hard to have much sympathy for him.