Dad Slugs Man Who Offers Money To Girl For Sex

In York, PA, a father took matters into his own hands after a shopper in a local Wal-Mart approached his daughter and offered to pay her for sex. (The girl was seventeen.) The father was charged with disorderly conduct and simple assault but those charges were later dropped after prosecutors decided that no jury would convict him.

Here's an outrageous viewpoint: I don't think they should have dropped the charges. I completely understand why the guy punched that scumbag in the face but I'm not so sure that they should allow one violent behavior because of another. Am I wrong here?