9/11 was the worst terrorist attack in US history, and everybody ranging from the Clintons to Joe Biden was there. You know why Trump wasn't there? Because he is going to commentate a freaking boxing match. Though many might believe his choice not to show up is trivial, him making the conscious decision that speaking while two people fight is more important than paying homage to the 3,000 dead New Yorkers and honoring the sacrifice policemen, firefighters, and even common civilians who lost their lives saving others, proves without a doubt what kind of person he is.