Are some of us born bad, or is harmful behaviour shaped by experience? How do nature and nurture influence our choices and morals? Watch Insight episode Born Bad? on SBS On Demand.

I was 20 years old when I learned an individual's actions could forever change the lives of many.

I grew up on farms in NSW and had lived a very sheltered life. I believed people were generally good, the world was generally safe, and I had never really been exposed to violence.

Read the full story at SBS News - Australia.