Cinematograffiti 38

OK, not that I have anything against this project, but somebody please explain it to me: first, you throw graffiti writers in jail for painting, then you invite some of the most influential and inspiring writers to whom they probably look up to, and organize a big jam inside. Anybody else having hard time figuring this out? Anyways, the final production is amazing and that is no surprise given the talent and rep of featured artists.
Oh, and btw, this is not the first correctional institution that I saw having some street art/graffiti inside their walls, now how is that supposed to "educate" those "vandals" inside and make them stop "damaging the public property" again once they get out?