. >> florida state representative angie nixon, calling on lawmakers to take action, after three blackere shot and killed a black in -- a 21-year-old white men opened fire on victims at the dollar general store -- near the city's only historically black city. and then he, shot and killed himself. -- the attack was without question, a hate crime, and an act of racially motivated extremism. jacksonville sheriffs -- today, describing the shooters manifesto, as the diary of a mad man. >> portions of these manifestos detailed the shooter's disgusting ideology of hate. plainly put, this shooting was racially motivated, and he hated black people. >> joining me now, msnbc political analyst and former hudson terry juliÁn castro, former fbi special agent and msnbc national security national security -- clint locks. clint, one of the things i wondered, as i watched all of the law enforcement officials speak yesterday, was one, how federal law enforcement officials miss a guy like this, how he manages to fly under the radar. and then of course, the big question, which is there is obviously a cult