Obviously it's not beating a woman, but it's still not OK. You see someone doing something wrong, you call the police and detain that person until they get there. If the cops had done what he supposedly did they'd be nailed for police brutality.
I don't think he was ever saying it was ok. This is far, far from ok.
He see's a man and a woman arguing, who happen to be Brother and Sister, so he goes crazy and beats the dude into a bloody pulp.
Lock this moron up for a while.
And to think Dana was trying to get Stephens out of his arrest because he thought Iowa had it in for him and Stephens. Utterly embarrassing and ridiculous on Dana's part.