Authorities revealed that Horton also lived in the neighborhood, about a half-mile from the scene, and may have been experiencing a mental health episode or under the influence of narcotics.

Or was he in a cop gang like the gangs that the L.A. Sheriff’s Department has and this was an initiation? Because that option feels almost as likely as the other two. If L.A. has cop gangs, why wouldn’t Atlanta?

https://en.wikipedia.org/wiki/Gangs_in_the_Los_Angeles_County_Sheriff's_Department