He was a idiot and already had a case pending against Hawthrone police department (the same one's that shot Max). He was trying to cause a scene, and it ended up poorly for Max.
**Rosby, who already has a criminal history and a pending case against the Hawthrone Police Department, admitted that he didn't "immediately" comply with their request and that his music was in fact "a little loud," but he was more concerned with "making sure other people's civil rights were not being violated."
Generally, citizens are well within their rights to film and record police officers on duty. But Rosby was disturbing an intense, active investigation with armed robbers and his leisurely or delayed cooperation resulted in officers choosing to take him into custody.**