Looking through Rotten Tomatoes ratings of Matt Damon’s movies released in 2017 there have been two hits (“Downsizing” and “Boston”), and two misses (“Suburbicon” and “The Great Wall”). Get ready to add another bomb to that list: “Backpack Full of Cash,” a 90-minute documentary on the school reform movement’s corrupt obsession with the “privatization” of public education. Even if the film reaches some measure […]