Now, in 50 years, I *can* remember my Dad expressing his dislike of the day once or twice, and stating he did, indeed, have greater concern for his own health when that date pops up. To me, that seems like a reasonable reaction to the anniversary of a loved one's death, much less two or more, and he just enjoys adding a twinge of mystique and drama to the retelling - he's my father after all.
But you never know.