Maybe it's me, but I think the 'craziest' thing here is that someone is taking secret pictures of a family eating food at DCA. It seems creepy.
This picture won't give anyone a license to bring food into the park. What do you expect them to say when you come to the park ready to knowingly break the rules, "Oh you got us... bring your food in."??
All this photo shows is that sometimes things get through. Ever been to a concert that explicitly says "NO CAMERAS" and then there are people in there with cameras? It happens.
Remember, just because most of us know the policy does not mean that everyone knows the policy. We here on MC are not necessarily representative of the average park visitor.
The one thing we don't see in this picture are all of the folks carrying outside food that got turned away. I'm pretty sure there'd be enough to fill a few memory cards.