Yeah, the incident you mention makes me wonder if "bullying" has too wide a definition. There's kids who bully 'cause they want a power trip, because they need to feel superior, because people doing their own thing is somehow insulting, but that's not the same as kids who drive a kid to suicide and show no remorse. At which point, we're talking major psychiatric dysfunction: sociopathy, or something else as serious. Not that it excuses the perpetrator, by any means, but it does mean you (and they) are going to need strong measures.

These things may exist on a continuum, but so does radiation. On one end, it makes you feel warm and cozy, on the other end you die.