Are some people BORN killers?

Understanding what motivates serial killers to murder many times over can be difficult to grasp. Over the past few decades, scientists have begun building a clearer picture of the minds behind some of the most shocking crimes. According to the largest forensic neuroscience library in the world, there are surprising similarities between the abnormal brains structures of mass murderers. Pictured left is James Eagan Holmes, who was convicted on 24 counts of murder and 140 counts of attempted murder forr the 2012 Aurora shooting a movie theater. What's more, the differences are'at least 50 percent caused by genetics', raising the disturbing possibility that people can be born killers.