As a psychiatrist, my professional opinion is that a single exchange in the debate last night reveals, exposes, and reminds us: Trump is a racist, toxic male. As a leader, he will be continue to be destructive to our mental health and social well-being. Biden is old yet competent, and has broadly earned our trust. Historians and experts rate Biden in the top third of all presidents, while Trump ranks dead last. Our choice in November is not ideal, but should be clear to us all.By Ravi Chandra.