Bad odds

How was it that even if they knew the location the plane crashed they still rescued only thirty three percent of the people. I would be so scared If I went down because only one out of every Three people that crashed and their location was known got rescued. I would hate to be in the airfoce back then Especially because the planes were so hard to control and so hard to bail out of. Why did they still us the B-24's if they crashed an killed so many people? It doesn't make sEnse