Tallulah : One of the last lines of the movie…

"So you make a habit of taking toddlers into protective custody?"
Why did he say this to her and then she smiles?

Because it so states she protected the child instead of kidnapped it. So she is validated for doing it out of goodness instead of malice. That's how i interpretated it.

I believe it was the filmmaker's way of hinting that Lu would get off easy because her intentions were good and in the end no harm was done.

..*.. TxMike ..*..
Sometimes I think we're alone in the universe, and sometimes not.

He said it to show that he understood why she did it and didn't see her as a 'bad person' and to tell us viewers that yeah she got caught but she'll be aight

Never hug a man with a million bucks worth of hardware up his crack.