That's because you are meant to care for the Tieflings and the writer sort of forgot to communicate that to the people in charge of the goblin story. There is even a goblin child "mourning" the loss of its parents that says they must have been weaklings if they died to REALLY hammer home to suffer not the greenskin.
Then they failed, because the first time I went to free Haslin, my reaction was "WTF! I just killed children".
