It is indeed very sad, Martha and everyone was very sorry for both the boys, William and Harry, when their mother died so suddently and so dramatically.
However, they are no longer boys. They were born in 1982 and 1982, so they are 40 and 38, and have had access to experts in minimising the effects of such events, and the support of their family.
Harry blames the royal family for her death, though he can hardly be unaware that Diana had dismissed her bodyguard that night, and that she and Dody Fayed were not wearing the seat belts which would have saved their lives when the car they were in was driven at high speed through a narrow tunnel, and crashed into another car. Because he believes as he does, he can't seem to stop himself relating everything that makes him anxious to the trauma he felt at that time, and linking it to the royal family who he thinks caused it all to happen.
William had exactly the same experience, but he doesn't relate every problem and setback in his life to his mother's death. Perhaps that is because he was 2 years older, perhaps because of an innate difference in personality.