I would start by asking myself how many young black men hanging out is too many.
Do you see a difference between hanging out and loitering?
Speaking of Ferguson and stopping/ticketing people, what about jaywalking? That is what Michael Brown and his friend were doing when Wilson first encountered them. Just yesterday, as I was driving past Chamblee High School a group of black teens crossed the road right in front of me! And they were also moving deliberately slowly, taking their time. Now, if a cop had witnessed this, don't you think that they would have deserved a ticket? Or would that have drawn the ire of the Holder DOJ?