As a person who sees  mental illness daily more than most people I would like to give my opinion.  I do NOT believe that Trumps actions are  "normal" I believe that he may have some sort of mental illness that has or has not been diagnosed. Federal laws prohibit anyone from saying if someone is being treated or has been treated in a behavior health clinic without their written consent so how do you know he doesn't? If he has a mental illness it does not reflect on any other person who has a mental illness. If he had arthritis I would not compare him to another person with arthritis. Mental illness is real and many people suffer from various degrees. Many people have it under control with the help of our great psychiatrists and clinicians and other wonderful people who make it their lifes ambitions to help with this not so understood illness.