CNN security correspondent Josh Campbell says we 100% percent know the WHCD shooter's motives thanks to his manifesto: KATE BOLDUAN: You're a former FBI agent. What do you make of the man's writings that he sent to family just before the attack?JOSH CAMBELL: Well, look, you know, you and I have covered so many acts of violence where there is often a lingering question about what was the motive. And sometimes that's laborious work for law enforcement to try to dig into that.You take, for example,

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