This stemmed from a conversation with Toby Hadoke last May, over BAFTA/Oscar tributes and their ability to omit people. And then from many, many conversations with poor old Jon Arnold following.
Arnold's belief, and one I share, is that if someone makes a mark on your life, however oblique, it is right to tip a hat of respect towards them at their death. They could have written a book you love, or been a hero of your childhood (or adulthood), or even had a passing role in an episode of a TV show you liked. Whatever they did, it is right to acknowledge their role in an aspect of your life, much as we hope others will do for us in the future when we are gone.