To make such an argument, it is important to highlight the importance of the rule of law.  The Supreme Court decision in this case was a good one because it upheld the rule of law.

In this case, President Nixon was claiming that his position as chief executive allowed him to keep the tapes secret.  He argued that he did not have to obey the subpoena because he had a right to keep all deliberations of the executive branch secret.  This is a very dangerous doctrine.  If presidents could keep information from the courts simply by asserting that they do not have to provide it, they would be above the law.  Therefore, the Court’s decision is good because it helped to emphasize that presidents are not above the law.