"Mental illness and hatred pull the trigger, not the gun,” President Trump announced when he condemned shootings in El Paso and Dayton, Ohio, which together left at least 31 people dead and dozens wounded.

Mr. President, what you said about hatred rings true. But you are wrong in blaming mental illness.

As the father of an adult son with a mental illness and one of 14 nongovernment experts appointed by your administration to a panel that advises Congress about serious mental illnesses, I’d like to recount some well-established facts.