Of course we do. He wanted to extort the $10 million, having the bizzare notion he could start his own nation. That was part of the trial testimony from a witness called against him. He also wished to assassinate his ex-wife as some point during the spree, in hopes of getting full custody of his children. She would seem like another unfortunate victim and he could conceal his guilt among the seemingly random killings. All of this was reported.
It was "reported". I think he needs a more thorough interrogation ~ by trained professionals.