If you find a legal loophole that lets you steal cars and subsequently take advantage of it to steal cars then you are still a car thief, still a bad person, and the theft is still newsworthy. The fact that your were "merely following incentives" does not make it right and does not make it uninteresting. Quite the opposite.

You're even more culpable if it is later discovered that you lobbied for the loophole.

Society's reaction should be to disseminate the surprising story and use it to drum up support to fix the law. At that point, the only reason to not pursue the matter further is to serve the higher principle of avoiding ex post facto legislation. It's an important principle, so we allow the crime to go unpunished, but the morality of the situation is still that the theft was wrong.