If you're suggesting that the US submarine should have rescued the survivors - with respect I think you don't understand how submarines work. They have no capability to perform rescue operations. They have no way to handle mass numbers of injuries, there's normally just one corpsman (basically a medic) on board. Even if they want to do a rescue operation they have no place to put them. Subs barely have room for their own crew; typically 2 or even 3 sailors share the same bed.

They should not have sunk the ship in the first place.