It's hard to be an adult on the "outside" of things.  I no longer work at a school, but even when I did, I often felt powerless.  The one time I defended a kid who had spent the better part of the year being bullied, I was reprimanded for my sympathy.  Maybe what we can do is put the power back in the hands of the kids themselves to stop their peers.  If we adults empower them, maybe they can make a difference.