As today's show begins we're awaiting an update from law enforcement in the suburb of Highland Park, Illinois, where yesterday yet another deranged person with a gun proved again that in the United States, nowhere -- and no day -- is safe. Police say the gunman fired a high-powered rifle from a rooftop into a crowd at a Fourth of July event, killing six and injuring dozens more. The Highland Park mayor says the shooter bought the gun legally, despite a growing body of online evidence of disturbing posts from this man fantasizing about carnage and carrying out attacks and even suicide by cop. "I just need to do it. It is my destiny," the suspect says in one of those posts. A former big-city police commissioner and former FBI agent join the show to discuss. 

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