I'm tending to agree with Tom's perspective.
Further, we have a knee-jerk reaction when we see something such as this, and I would point out our initial reaction is anything but indifferent. Our first impulse is to indeed lash out at the offenders.
But there is always two sides to every story. Before we string the kids up by their balls, let's be damned sure of all the circumstances.
What we as a society seem to actually be indifferent to is making sure parents are monitoring their children and are actually parenting them. Including those more affluent parents who apparently don't seem to have time for their kids.
I have the misfortune of knowing a family whose child did a murder. He was hounded by a bully. His girlfriend was raped by the bully. The bully bragged he would do it again and threatened his life. He's in adult prison, no parole. No prior record of any kind. It's made me rethink my attitude against juvenile leniency. Who's to blame? His parents? The bully's parents?