Human Rights, Activism and George Takei

On today’s show: Legal professor Samuel Moyn looks at the history and politics of human rights and talks about what justifies humanitarian intervention. Actor, activist and social media superstar George Takei discusses his life and career—along with Jennifer Kroot, who’s made a documentary called “To Be Takei.” Five-time Grammy winner Marty Stuart talks about his photographs of legendary musicians, eccentric characters and portraits of members of the Lakota tribe. And we’ll look at the growing militarization of American policing and why some small town sheriffs’ departments have been given heavily armored tanks.