Then consider the possibility that the goblins themselves have to make the same choices you want the players to make; they, too, are friends and enemies with other goblins, who they would rather see the party killing than they themselves. A dilemma begins when you communicate this idea to the party through their intended victims: Are they killing the RIGHT goblins?
Perhaps, the goblins try to suggest, if a parley is possible, the party would do better to kill the goblins down the way - which these goblins would be happy to help the party find . . .
Does the party take the suggestion? Or assume these goblins are lying? What if killing these goblins makes it impossible to find the OTHER goblins? Decisions, decisions.