Mother arrested for letting daughter play in park
So this woman is working at McDonald's. She can't afford child care, obviously, so she takes her daughter to work. The kid gets bored after a few days, so Mom gives her a cell phone and lets her go to the local park. Someone else at the park is so concerned about the possibility that the child will be snatched by strangers (never mind that the chance of that is lower now than any time in America's history) that she calls the police.
The end result? The police - who are of course strangers to the girl and her mom - take the kid away. Then they arrest the mom.
Once again, we see the police preventing a crime by committing it.
The only danger the child was in was the potential danger of being snatched. The only harm here was a child that might be abducted by strangers. And the state's response is to have the child abducted by strangers.