An article in USA Today about the first court appearance by Florida airport shooting rampage suspect Esteban Santiago quotes Charles Ewing, SUNY Distinguished Professor of Law, who said motive probably doesn’t matter in this case. "The term 'motive' usually connotes a rational reason for doing something," he said. "People who are hearing voices or suffering delusions – as this suspect appeared to be – often act irrationally. Moreover, proof of motive is not required for the prosecution of any crime, including murder."

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http://www.usatoday.com/story/news/nation/2017/01/09/security-fort-lauderdale-airport-where-needs/96337418/