Nadav Schirman lets his subject tell his story to the camera. Schirman juxtaposes this with footage of the only other talking head in “The Green Prince,” Yousef’s Shin Bet handler, Gonen Ben Yitzhak. The viewer is forced to consider the lives of both men, the excruciating choices they make, and whether we would be able to make those choices. Yitzhak’s descriptions of how his degree in psychology allowed him to perfect the psychological manipulation of those whom he interrogated have a creepy power.“The Green Prince” addresses the Israel-Palestine conflict through the intimate, personal story of Mosab Hassan Yousef. Yousef titled his memoir “Son of Hamas,” as he was the eldest son of one of that organization’s most prominent voices. But to Shin Bet, the Israeli security agency with which he collaborated for 10 years, Yousef was known by the colorful royal name that gives this film its title.