The police probably responded to the 911 call for an ambulance. Supposedly, the message they got was that a 13 year old was bashing a 6 year old with a rock, they assumed gang violence, and responded accordingly. As for probable cause, they had a rock, a bleeding boy, lots of witnesses, etc.

What happened to parents talking to their kids and to the other parents about what is and isn't ok behavior and thinking before you do something and learning how to develop some judgement, etc.?

Been asking that for years...