RE the Secret Service study, I haven't read it, but it seems to me that it is similar to the argument that "many serial killers were adopted, therefore adoption leads to serial killing". The N for school shooters is really small. The overwhelming majority of students who fought back against bullies, did NOT become school shooters. And, there is likely another factor present in these kids that makes that kind of violence seem reasonable when it would not for most.

That said, I think fighting back should be a last resort. However, this requires a school that is willing and able to provide students with real alternatives for protecting themselves and preventing bullying.