It's a sad story but it could have been prevented by the victim.

The person killed was a thief, having stolen money that a man who was urinating against a wall dropped. Had he picked up the money and returned it to the man - nothing would have happened. Sometimes you don't know who you are messing with until it is too late. In this case it was an ex con and the victim learned the ultimate lesson. Hopefully his family and friends learn that crime doesn't pay.