So, we think the plane went down in the ocean. A really deep part of the ocean. There is little wreckage that has been seen/found.

Why spend a gazillion dollars on finding a wrecked airplane filled with, sadly, dead people? Sure, finding the data recorders will give us cockpit conversations, and a possible motive. But again, we know the final result, so what good is the motive/motives? Let the families grieve and get on with their lives. How would you feel they find the plane and recover all the bodies -1, your loved one?

Just let things alone.