Stonings

Sometimes I don't understand how people can call themselves human and participate in stonings. How can one honestly believe in a god or a so-called holy book that would sponsor such behavior as this:

Aisha Ibrahim Duhulow, 13, who in Somalia in 2008, in front of a thousand people, was dragged to a hole in the ground – all the while screaming, "I'm not going – don't kill me" – then buried up to her neck and stoned by 50 men for adultery[.] After 10 minutes, she was dug up, found to be still alive and put back in the hole for further stoning. Her crime? She had been raped by three men and, fatally, her family decided to report the facts to the Al-Shabab militia that runs Kismayo.