I mean they are dead what do they care about the world of the living?
This is a good question. It depends on SRD's cosmology - the meaning of both life and death, and what form existence takes and what purposes exist for those that have passed on.
In my (admittedly Christian) cosmology, it doesn't make any sense, but if SRD has an explanation, it would have to be elaborate to cover all the bases and make sense.
As we care about this story, so, perhaps, the angels care about our story, in a similar manner brought into being by a Creator and totally dependent on His will. (Badly expressed, but it's a little easier to understand and accept the idea of a God when we understand the idea of an author)
"Eh? Two views? There are a dozen views about everything until you know the answer. Then there's never more than one." Bill Hingest ("That Hideous Strength" by C.S. Lewis)
"These are the days when the Christian is expected to praise every creed except his own." G.K. Chesterton