Your comments are made in the context of the OJ story, so to say “Dont we all want our executors to try to carry out our wishes to the best of their ability?” is incredibly dishonest.
Personal representatives must pay the debts of the estate. They can decline or challenge debts that they believe to be invalid. The debt to the Goldman family is a valid judgment from a court of competent jurisdiction. What legitimate challenge is the personal representative making about the debt?
I assume the challenge is an effort to waste all of the assets of the estate on attorneys fees and administration costs. Essentially so that when a court tells them that they must pay the Goldman family that there are no assets left to pay.