Perhaps you live in Facebook land where Facebook is recognized as a law enforcement authority.
Do you have Facebook on speed-dial in case you have a crime erupt?
Are there "Like" buttons for stuff like that?
First I don’t care for your opinion on this at all. Maybe you are on the wrong forum. Yes facebook could have contacted the police and if it is proven they were aware and did nothing this kid and his family should own it. Other hand they may have reported it. Either way your response is trollish at best here.