Believe you have to kill alits to get grease so you can open the door. Whether or not that's actually what they're doing I can't really say but you do have to kill them as a part of the quest.
Will say though that if they're just there to farming them that's pretty messed up. Not Kosher to grind quest mobs.
Maotti_Nor wrote: »You must be on console, this has already been nerfed apparently on PC.