The problem is there is only an incentive -in the game- to take the evil path with the goblins if you're chaotic evil, evil for evil's sake aka chaotic stupid. There is no incentive to play a smart lawful evil -in the game-.You seem quite happy with the way things are and when things don't fit story wise you're fine with thinking of convoluted ways and bending over backwards in your mind about how to motivate yourself to continue to play evil. Might I suggest it's because you're playing chaotic evil? I can't see how else you are the only one in this thread thinking the evil path is fine the way it is.
