Murdered for her bike.

This week, I'm sure you all heard of the Autumn Pasquale Murder. A boy, Justin Robinson, invited Autumn to his house to see her bike. The boy and his older brother then stole the bike and killed her. While the Police were still trying to identify the killer, Justin had a passing interest in the case. He attended a candle light vigil, liked a facebook page dedicated to Autumn and wrote on Autumn's older brother's timeline. After investigating the police identified Justin and his older brother as the killers.  I found it interesting that Justin went to the candle vigil and was so involved in the case on facebook. Facebook is what led the police to identify Justin and hi brother of the murder.  Days before Autumn disappeared Justin was talking to her on facebook asking to see her bike. I don't understand why someone would kill someone over a bike. But i do see that he was involved in the case after the murder, whether it was to try and show interest or whether he felt remorse. What do you think????