I too am agnostic on the usage of law enforcement to try and corral citizens into the proper moral circle.  Perhaps suspecting the prostitute was a minor made the sting more legitimate...I don't know the details.

Hypothetically, what do you suppose would have happened to Athans had he not been driving on a suspended license?  Would he have gotten off without a scratch, or would he have been toting around the sex-offender label the rest of his life?