The thing Hamming understood, but which Bostrom, et al. don't is that sometimes even if something is extremely important or significant the lack of any reasonable approach to it makes it an unattractive thing to expend effort on. At least until a solution is more tractable.
Further, the idea that everyone dying is some great tragedy is only true in the philosophy Bostrom and others have adopted. It is one of massive egoism and human-centrism that I think is misplaced. These same people then reject any philosophies that lessen the devastation of death on the grounds that they are the fictions of lesser minds attempting to placate themselves over their impending death. But there is no objectively true philosophy. The whole point of philosophy is to invent a fiction that lets you cope with reality in a productive way.