I was shivering in bed on my first night in Mogadishu. At 3:30 am, I killed the air conditioner. Moments later, the room felt stuffier than a London subway. I got up and paced around, wondering if it was safe to keep the balcony door open.

This clip features General Buttnaked (a.k.a. Joshua Milton Blahyi), who reputedly killed over 25,000 people during the civil war in Liberia, making him history’s greatest mass murderer. I interviewed and filmed him near Monrovia/Liberia in 2008, where he said he had”converted” to Christianity and was saving former child soldiers. During...