Sorry, you think it's impossible to hurt Trump? Are you forgetting the bullet that passed an inch from his brain? A crazy person with a gun can change history in a second, and it would've been a terrible violent occurrence throughout society if it had come to pass.
At his level of wealth it's a choice to be that exposed physically, just as it's a choice to be exposed at that level psychologically is my point.
Someone with Trump's level of wealth could retire to an island and be like Elvis in his later years only dealing through people with intermediaries. They could have the best doctors, the best fitness regime and the best diet, and the best security and hundreds of miles between them and physical threats.
