Has he informed on any of these 'communities he's worked with'? If not, then he's not betrayed the trust of anyone except those two men who are alleged to have intended to do harm to police officers in St. Paul.
Since Columbine, we have encouraged young people to let their parents or other authority figures know if someone they know is planning an attack on their schools. I don't see anything different in what this man did.
Makes ya proud to know our next President is an experienced “community activist”.