He said his experience of teaching songwriting at Rimutaka Prison had shown him troubled youth needed strong mentors and plenty of things to do.
"It's a complex situation, with only victims and no winners, but we've got to do something," Mr Maxwell said.
The singer-songwriter called for residents to support youth workers and others in engaging the town's teens to overcome an "us and them" split and avoid a repeat of Sunday's tragedy.
Acting Wairarapa area commander Senior Sergeant Mike Sutton told Fairfax extra police were going to Featherston to help "extremely vulnerable and emotional young people who are struggling to come to terms with what has happened".