I dare to disagree ... Those goblins are there to kill anything that isnt goblin ... it would be nice if they recognize Drow, or Duegar (if they will be playable) and concider them as "not kill on sight, unless they proove themself to be hostile" ... but in that case, defenders should be hostile before you attack some Goblin to show you dont belong to them.
That should add some interesting flavor to that fight. But otherwise? I believe they should attack us. :-/