Of course, neither North York nor Hannam’s family have any obligation to answer those questions.

Let's not be stupid. Yes they do. If you're in the jabbie cult which refuses to attribute any negative outcome to them, even to the extent you'll leave some possibilities unexplored about a loved one's death, then that's one thing. Enjoy your privacy, having abdicated all moral responsibility. But if you're a normal human being you'll chase it up and ask those questions yourself, or at the very least release enough information to let other people ask those questions for you.