That's the problem- he didn't consult with the police. It says the girls' disappearance was reported to police- that's it. Once he found out where his daughters were, he should have phoned the police in Durham and reported they were at an underage drinking party. But he didn't do that. He took the law into his own hands. Luckily no one was injured or killed. By the way, everyone, whether it's a bunch of frat guys or the little old lady who lives in a shoe, has a right to protect their home. Since he entered their home uninvited, they had every right to throw him out or hold him until the police arrived.
That means he was invited! This is why it really is important to clearly indicate that visitors should wait for a personal invitation before entering.
Besides, these young men were running a dive and the public accommodation laws probably applied.
How do you know he didn't do that? Maybe he did. Maybe they said "So what?"
Going to pick up your daughters is taking the law into your own hands?