"But it really isn't. It's opportunistic and predatory." - YES!!!!!
How jw's do not see themselves as just plain weird is beyond me. It is one thing to say, "you are in my prayers" and quite another to get a personal note from a complete stranger after a loved one has died. One that the jw has no clue about and has never met attempting to tell you what to believe about the afterlife and that of your loved one.
I think part of the problem is that jw's do not grieve in the same way others do. I don't know, that's all I can think of. "Yep, they are dead so sad, now let's get out in service so we can get over it and not think of such unpleasantness."
Makes 'em sound rather like cold callous s.o.b.'s doesn't it?