Welcome to the Knockout Game. As long as one punch killings result in misdemeanor convictions involving prison terms of at most a few months for adult offenders (and presumably less for juveniles), the Knockout Game will remain immensely popular among people in The Community.
Social justice is their protection
Not long after the first reports, the “teens” immediately claimed the [now dead] man said “words” to them...because words are justification for murder, I reckon.