How best to entertainingly explain to filmgoers the crime-reducing benefits of legalized abortion and why real-estate agents are like the Ku Klux Klan? Maybe with an all-star documentary with segments by Heidi Ewing and Rachel Grady, Alex Gibney, Seth Gordon, Eugene Jarecki, and Morgan Spurlock? Exactly such a movie will close this year’s Tribeca Film Festival on May 2, which we guess means our pitch for a Freakonomics adaptation has been rejected. [Tribeca Film Festival]