Because he cannot stop trying to make himself the hero of every story, however fictional it might be. Remember when he claimed he saw American Muslims cheering in NJ, when in reality the only footage he could have seen of anyone celebrating would have been from East Palestine on another continent about 5700 miles from NJ? Yeah. Good times.
He also said he saw the buildings fall, from Trump Tower, if you've been to NYC you know that is impossible.
He has "fantasy dementia." You know he is almost as old as Biden.